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Momentum operator

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961: 693: 956:{\displaystyle {\begin{aligned}\nabla \psi &=\mathbf {e} _{x}{\frac {\partial \psi }{\partial x}}+\mathbf {e} _{y}{\frac {\partial \psi }{\partial y}}+\mathbf {e} _{z}{\frac {\partial \psi }{\partial z}}\\&={\frac {i}{\hbar }}\left(p_{x}\mathbf {e} _{x}+p_{y}\mathbf {e} _{y}+p_{z}\mathbf {e} _{z}\right)\psi \\&={\frac {i}{\hbar }}\mathbf {p} \psi \end{aligned}}} 3596: 3254: 1824: 2647: 3437: 534: 3101: 1645: 2869: 3426: 609:
of other states, when this momentum operator acts on the entire superimposed wave, it yields the momentum eigenvalues for each plane wave component. These new components then superimpose to form the new state, in general not a multiple of the old wave function.
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defines limits on how accurately the momentum and position of a single observable system can be known at once. In quantum mechanics,
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At the time quantum mechanics was developed in the 1920s, the momentum operator was found by many theoretical physicists, including
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This momentum operator is in position space because the partial derivatives were taken with respect to the spatial variables.
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so the tilde represents the Fourier transform, in converting from coordinate space to momentum space. It then holds that
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Bonneau, G., Faraut, J., Valent, G. (2001). "Self-adjoint extensions of operators and the teaching of quantum mechanics".
2864:{\displaystyle T(\varepsilon )=1-\varepsilon {d \over dx}=1-{i \over \hbar }\varepsilon \left(-i\hbar {d \over dx}\right)} 4237: 3421:{\displaystyle \gamma ^{\mu }{\hat {P}}_{\mu }=i\hbar \gamma ^{\mu }\partial _{\mu }={\hat {P}}=i\hbar \partial \!\!\!/} 1959:{\displaystyle {\hat {p}}=\int \!\!dp~|p\rangle p\langle p|=-i\hbar \int \!\!dx~|x\rangle {\frac {d}{dx}}\langle x|~,} 622:
is used instead of one partial derivative. In three dimensions, the plane wave solution to Schrödinger's equation is:
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so the momentum of the particle and the value that is measured when a particle is in a plane wave state is the
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for a specific mathematical discussion and proof for the case of a single, uncharged, spin-zero particle. See
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is a multiplication operator in the position representation. Note that the definition above is the
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expressed in the momentum representation, the action of the operator is simply multiplication by
102: 1328:, a gauge invariant physical quantity, can be expressed in terms of the canonical momentum, the 4033: 1407:. For electrically neutral particles, the canonical momentum is equal to the kinetic momentum. 4201: 3897: 2882: 1619: 1235: 606: 259: 36: 1431:(In certain artificial situations, such as the quantum states on the semi-infinite interval 605:, the momentum operator is also linear, and because any wave function can be expressed as a 3926: 3869: 3771: 3284: 2382: 1639: 1239: 1464:
to an arbitrary state in either the position or momentum basis, one can easily show that:
282: 8: 2874: 3930: 3873: 3775: 4012: 3885: 3859: 3300: 3296: 1421: 263: 251: 32: 28: 4112: 3965: 3942: 3810: 3789: 3664: 3645: 2656: 2358:{\displaystyle \langle x|{\hat {p}}|x'\rangle =-i\hbar {\frac {d}{dx}}\delta (x-x'),} 1623: 1616: 1612: 1247: 1227: 278: 247: 20: 3889: 2250:{\displaystyle \langle p|{\hat {x}}|p'\rangle =i\hbar {\frac {d}{dp}}\delta (p-p'),} 1582:{\displaystyle \left={\hat {x}}{\hat {p}}-{\hat {p}}{\hat {x}}=i\hbar \mathbb {I} ,} 404:
is the particle energy. The first order partial derivative with respect to space is
4216: 4038: 3934: 3877: 3779: 3030: 2052:{\displaystyle \langle x|{\hat {p}}|\psi \rangle =-i\hbar {\frac {d}{dx}}\psi (x).} 1966:
that is, the momentum acting in coordinate space corresponds to spatial frequency,
1461: 1436: 1404: 1337: 1329: 1325: 1318: 267: 151: 2144:{\displaystyle \langle p|{\hat {x}}|\psi \rangle =i\hbar {\frac {d}{dp}}\psi (p),} 4232: 4133: 4080: 3833: 3015: 1061: 602: 255: 683:{\displaystyle \psi =e^{{\frac {i}{\hbar }}(\mathbf {p} \cdot \mathbf {r} -Et)}} 4143: 4043: 3315: 3307: 3288: 2744:{\displaystyle \psi (x-\varepsilon )=\psi (x)-\varepsilon {\frac {d\psi }{dx}}} 2410:
represents the length of the translation. It satisfies the following identity:
1217:{\displaystyle {\hat {p}}={\hat {p}}_{x}=-i\hbar {\partial \over \partial x}.} 1137: 1065: 112: 3784: 3759: 2061:
An analogous result applies for the position operator in the momentum basis,
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The derivation in three dimensions is the same, except the gradient operator
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The momentum and energy operators can be constructed in the following way.
3864: 3742:{\textstyle -i\hbar \int dx\left|x\right\rangle \partial _{x}\langle x|.} 3311: 1310:{\textstyle {\hat {p}}\psi =-i\hbar {\frac {\partial \psi }{\partial x}}} 997: 3283:
preceding the 3-momentum operator. This operator occurs in relativistic
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and not a measurable physical quantity for charged particles in an
3087:{\displaystyle P_{\mu }=\left({\frac {E}{c}},-\mathbf {p} \right)} 587:{\displaystyle {\hat {p}}=-i\hbar {\frac {\partial }{\partial x}}} 88:{\displaystyle {\hat {p}}=-i\hbar {\frac {\partial }{\partial x}}} 3807:
Quantum Physics of Atoms, Molecules, Solids, Nuclei and Particles
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Quantum Physics of Atoms, Molecules, Solids, Nuclei and Particles
2885:, so the relation between translation and momentum operators is: 1394:{\displaystyle \mathbf {\hat {P}} =-i\hbar \nabla -q\mathbf {A} } 1068:, the momentum operator can be written in the position basis as: 1317:
will change its value. Therefore, the canonical momentum is not
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is the spatial coordinate, and a partial derivative (denoted by
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Mathematical descriptions of the electromagnetic field
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In the position coordinate representation, that is,
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Born, M.; Jordan, P. (1925). "Zur Quantenmechanik".
3314:of the 4-momentum is given by contracting with the 3000:{\displaystyle {\hat {p}}=-i\hbar {\frac {d}{dx}}.} 1105:{\displaystyle \mathbf {\hat {p}} =-i\hbar \nabla } 1037:{\displaystyle \mathbf {\hat {p}} =-i\hbar \nabla } 3741: 3590: 3420: 3248: 3086: 2999: 2940: 2863: 2743: 2641: 2494: 2357: 2249: 2143: 2051: 1958: 1818: 1603: 1581: 1393: 1309: 1216: 1104: 1036: 955: 682: 586: 528: 384: 220: 142: 87: 3959: 3758:Zinn-Justin, Jean; Guida, Riccardo (2008-12-04). 3502: 3412: 3411: 3410: 3166: 3014:Inserting the 3d momentum operator above and the 1903: 1902: 1852: 1851: 1739: 1738: 1688: 1687: 1449: 1359: 1081: 1013: 4254: 3757: 1321:, and hence not a measurable physical quantity. 2387:Stone's theorem on one-parameter unitary groups 1049: 3997: 3902:: CS1 maint: multiple names: authors list ( 3725: 2618: 2595: 2575: 2572: 2549: 2535: 2532: 2489: 2475: 2472: 2437: 2299: 2263: 2194: 2158: 2099: 2068: 2004: 1973: 1939: 1921: 1876: 1870: 1729: 1715: 1712: 1698: 1678: 1664: 3960:Sakurai, Jun John; Napolitano, Jim (2021). 4004: 3990: 3916: 2377:Derivation from infinitesimal translations 3863: 3783: 1597: 1572: 4011: 3663:, D. McMahon, Mc Graw Hill (USA), 2006, 3613:Translation operator (quantum mechanics) 1000:for the three spatial dimensions, hence 1143:In one spatial dimension, this becomes 538:This suggests the operator equivalence 4255: 3009: 2151:leading to further useful relations, 3985: 305:Starting in one dimension, using the 3838:Lecture notes 4 by Robert Littlejohn 3827:Lecture notes 1 by Robert Littlejohn 1633: 143:{\displaystyle \partial /\partial x} 613: 13: 3716: 3579: 3558: 3546: 3542: 3407: 3374: 3237: 3219: 3207: 3203: 1638:The following discussion uses the 1420:The momentum operator is always a 1377: 1298: 1290: 1202: 1198: 1099: 1031: 807: 799: 772: 764: 737: 729: 701: 601:Since the partial derivative is a 575: 571: 437: 414: 396:is interpreted as momentum in the 293:Origin from de Broglie plane waves 209: 201: 134: 126: 76: 72: 14: 4274: 3692: 3575: 3522: 3404: 3360: 3233: 3183: 2976: 2918: 2838: 2819: 2311: 2203: 2108: 2016: 1896: 1806: 1771: 1568: 1374: 1284: 1193: 1096: 1028: 936: 831: 645: 566: 515: 474: 459: 351: 195: 67: 3499: 3163: 3075: 1387: 1356: 1078: 1010: 942: 903: 878: 853: 786: 751: 716: 662: 654: 300: 1403:The expression above is called 1226:This is the expression for the 4207:Hanbury Brown and Twiss effect 3953: 3910: 3843: 3819: 3800: 3751: 3732: 3673: 3654: 3635: 3487: 3448: 3392: 3342: 3148: 3112: 2961: 2932: 2901: 2895: 2775: 2769: 2712: 2706: 2697: 2685: 2636: 2624: 2611: 2588: 2565: 2542: 2519: 2482: 2465: 2461: 2455: 2430: 2426: 2420: 2349: 2332: 2287: 2280: 2270: 2241: 2224: 2182: 2175: 2165: 2135: 2129: 2092: 2085: 2075: 2043: 2037: 1997: 1990: 1980: 1946: 1914: 1883: 1863: 1839: 1794: 1788: 1782: 1722: 1705: 1671: 1658: 1652: 1556: 1544: 1529: 1517: 1497: 1482: 1456:Canonical commutation relation 1450:Canonical commutation relation 1415: 1266: 1172: 1156: 1060:For a single particle with no 675: 650: 551: 497: 479: 432: 420: 374: 356: 335: 323: 177: 52: 1: 3661:Quantum Mechanics Demystified 3628: 1410: 16:Operator in quantum mechanics 1604:{\displaystyle \mathbb {I} } 7: 3852:American Journal of Physics 3623:Pauli–Lubanski pseudovector 3618:Relativistic wave equations 3601: 3432:(− + + +) 3293:relativistic wave equations 3028:(+ − − −) 1056:Position and momentum space 1050:Definition (position space) 313:of a single free particle, 10: 4279: 2380: 1453: 1253:group transformation, and 1053: 4238:Creation and annihilation 4225: 4194: 4178: 4152: 4126: 4100: 4093: 4068: 4052: 4026: 4019: 3785:10.4249/scholarpedia.8287 1230:. For a charged particle 4186:Transition dipole moment 3962:Modern quantum mechanics 3434:, the operator would be 4076:Anti-symmetric operator 4069:Operators for operators 2667:), one may expand in a 1128:reduced Planck constant 598:of the above operator. 244:multiplication operator 234:consisting of momentum 150:) is used instead of a 103:reduced Planck constant 3919:Zeitschrift für Physik 3743: 3592: 3422: 3250: 3088: 3001: 2942: 2865: 2745: 2663:in some domain of the 2651:Assuming the function 2643: 2496: 2371:Dirac's delta function 2359: 2251: 2145: 2053: 1960: 1820: 1605: 1583: 1395: 1311: 1218: 1106: 1038: 957: 684: 588: 530: 386: 311:Schrödinger's equation 222: 144: 89: 3840:for the general case. 3744: 3593: 3430:If the signature was 3423: 3251: 3089: 3002: 2943: 2866: 2746: 2644: 2497: 2360: 2252: 2146: 2054: 1961: 1821: 1620:uncertainty principle 1606: 1584: 1454:Further information: 1440:translation operators 1396: 1312: 1242:, the position space 1236:electromagnetic field 1219: 1107: 1039: 958: 685: 589: 531: 387: 260:electromagnetic field 223: 145: 90: 37:differential operator 4013:Operators in physics 3683: 3438: 3322: 3285:quantum field theory 3102: 3037: 2952: 2889: 2881:is the generator of 2873:As it is known from 2763: 2679: 2506: 2414: 2393:translation operator 2260: 2155: 2065: 1970: 1830: 1646: 1593: 1468: 1350: 1257: 1240:gauge transformation 1147: 1072: 1004: 694: 690:and the gradient is 626: 542: 408: 317: 266:is not equal to the 262:. In that case, the 168: 123: 43: 31:associated with the 3931:1925ZPhy...34..858B 3874:2001AmJPh..69..322B 3776:2008SchpJ...3.8287Z 3297:partial derivatives 3096:4-momentum operator 3010:4-momentum operator 2875:classical mechanics 1628:conjugate variables 4212:Quantum correlator 3939:10.1007/BF01328531 3832:2012-06-17 at the 3760:"Gauge invariance" 3739: 3588: 3418: 3301:Lorentz covariance 3246: 3084: 2997: 2938: 2861: 2741: 2639: 2492: 2355: 2247: 2141: 2049: 1956: 1816: 1642:. One may write 1601: 1579: 1428:) quantum states. 1422:Hermitian operator 1391: 1307: 1228:canonical momentum 1214: 1102: 1034: 953: 951: 680: 584: 526: 382: 264:canonical momentum 252:canonical momentum 218: 140: 85: 4263:Quantum mechanics 4250: 4249: 4246: 4245: 4233:Casimir invariant 4089: 4088: 3971:978-1-108-47322-4 3882:10.1119/1.1328351 3815:978-0-471-87373-0 3650:978-0-471-87373-0 3553: 3538: 3505: 3490: 3479: 3451: 3395: 3345: 3214: 3199: 3169: 3151: 3140: 3115: 3066: 2992: 2964: 2935: 2921: 2854: 2822: 2803: 2739: 2383:Noether's theorem 2327: 2283: 2219: 2178: 2124: 2088: 2032: 1993: 1952: 1937: 1912: 1861: 1842: 1811: 1809: 1785: 1748: 1697: 1634:Fourier transform 1626:and momentum are 1559: 1547: 1532: 1520: 1500: 1485: 1362: 1305: 1269: 1209: 1175: 1159: 1084: 1016: 939: 834: 814: 779: 744: 648: 582: 554: 518: 477: 462: 444: 354: 283:Erwin Schrödinger 279:Arnold Sommerfeld 248:position operator 216: 180: 83: 55: 25:momentum operator 21:quantum mechanics 4270: 4226:Particle physics 4179:Electromagnetism 4153:Angular momentum 4098: 4097: 4024: 4023: 4006: 3999: 3992: 3983: 3982: 3976: 3975: 3957: 3951: 3950: 3914: 3908: 3907: 3901: 3893: 3867: 3865:quant-ph/0103153 3847: 3841: 3823: 3817: 3804: 3798: 3797: 3787: 3755: 3749: 3748: 3746: 3745: 3740: 3735: 3724: 3723: 3714: 3677: 3671: 3658: 3652: 3639: 3597: 3595: 3594: 3589: 3587: 3586: 3565: 3561: 3554: 3552: 3541: 3539: 3531: 3512: 3508: 3507: 3506: 3498: 3492: 3491: 3483: 3480: 3472: 3459: 3458: 3453: 3452: 3444: 3433: 3427: 3425: 3424: 3419: 3417: 3397: 3396: 3388: 3382: 3381: 3372: 3371: 3353: 3352: 3347: 3346: 3338: 3334: 3333: 3282: 3275: 3264: 3255: 3253: 3252: 3247: 3245: 3244: 3226: 3222: 3215: 3213: 3202: 3200: 3192: 3176: 3172: 3171: 3170: 3162: 3153: 3152: 3144: 3141: 3133: 3123: 3122: 3117: 3116: 3108: 3093: 3091: 3090: 3085: 3083: 3079: 3078: 3067: 3059: 3049: 3048: 3031:metric signature 3029: 3006: 3004: 3003: 2998: 2993: 2991: 2980: 2966: 2965: 2957: 2947: 2945: 2944: 2939: 2937: 2936: 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1487: 1486: 1478: 1460:By applying the 1434: 1405:minimal coupling 1400: 1398: 1397: 1392: 1390: 1364: 1363: 1355: 1345: 1338:vector potential 1335: 1330:scalar potential 1326:kinetic momentum 1316: 1314: 1313: 1308: 1306: 1304: 1296: 1288: 1271: 1270: 1262: 1233: 1223: 1221: 1220: 1215: 1210: 1208: 1197: 1183: 1182: 1177: 1176: 1168: 1161: 1160: 1152: 1135: 1125: 1115: 1111: 1109: 1108: 1103: 1086: 1085: 1077: 1043: 1041: 1040: 1035: 1018: 1017: 1009: 995: 984: 973: 962: 960: 959: 954: 952: 945: 940: 932: 924: 917: 913: 912: 911: 906: 900: 899: 887: 886: 881: 875: 874: 862: 861: 856: 850: 849: 835: 827: 819: 815: 813: 805: 797: 795: 794: 789: 780: 778: 770: 762: 760: 759: 754: 745: 743: 735: 727: 725: 724: 719: 689: 687: 686: 681: 679: 678: 665: 657: 649: 641: 614:Three dimensions 593: 591: 590: 585: 583: 581: 570: 556: 555: 547: 535: 533: 532: 527: 519: 514: 506: 501: 500: 478: 470: 463: 458: 450: 445: 443: 435: 412: 403: 399: 395: 391: 389: 388: 383: 378: 377: 355: 347: 268:kinetic momentum 241: 227: 225: 224: 219: 217: 215: 207: 199: 182: 181: 173: 163: 152:total derivative 149: 147: 146: 141: 133: 118: 110: 100: 94: 92: 91: 86: 84: 82: 71: 57: 56: 48: 4278: 4277: 4273: 4272: 4271: 4269: 4268: 4267: 4253: 4252: 4251: 4242: 4221: 4190: 4174: 4148: 4122: 4085: 4081:Ladder operator 4064: 4048: 4015: 4010: 3980: 3979: 3972: 3958: 3954: 3915: 3911: 3895: 3894: 3848: 3844: 3834:Wayback Machine 3824: 3820: 3805: 3801: 3756: 3752: 3731: 3719: 3715: 3704: 3684: 3681: 3680: 3678: 3674: 3659: 3655: 3640: 3636: 3631: 3604: 3582: 3578: 3545: 3540: 3530: 3529: 3525: 3497: 3496: 3482: 3481: 3471: 3467: 3463: 3454: 3443: 3442: 3441: 3439: 3436: 3435: 3431: 3413: 3387: 3386: 3377: 3373: 3367: 3363: 3348: 3337: 3336: 3335: 3329: 3325: 3323: 3320: 3319: 3277: 3270: 3263: 3257: 3240: 3236: 3206: 3201: 3191: 3190: 3186: 3161: 3160: 3143: 3142: 3132: 3131: 3127: 3118: 3107: 3106: 3105: 3103: 3100: 3099: 3074: 3058: 3057: 3053: 3044: 3040: 3038: 3035: 3034: 3027: 3016:energy operator 3012: 2984: 2979: 2956: 2955: 2953: 2950: 2949: 2927: 2926: 2913: 2890: 2887: 2886: 2846: 2841: 2831: 2827: 2814: 2795: 2790: 2764: 2761: 2760: 2756: 2731: 2723: 2721: 2680: 2677: 2676: 2672: 2652: 2610: 2587: 2564: 2541: 2518: 2507: 2504: 2503: 2481: 2464: 2429: 2415: 2412: 2411: 2407: 2396: 2389: 2379: 2366: 2341: 2319: 2314: 2291: 2286: 2275: 2274: 2269: 2261: 2258: 2257: 2233: 2211: 2206: 2186: 2181: 2170: 2169: 2164: 2156: 2153: 2152: 2116: 2111: 2091: 2080: 2079: 2074: 2066: 2063: 2062: 2024: 2019: 1996: 1985: 1984: 1979: 1971: 1968: 1967: 1945: 1929: 1924: 1913: 1882: 1862: 1834: 1833: 1831: 1828: 1827: 1798: 1777: 1776: 1766: 1756: 1752: 1751: 1749: 1721: 1704: 1670: 1647: 1644: 1643: 1636: 1596: 1594: 1591: 1590: 1571: 1551: 1550: 1539: 1538: 1524: 1523: 1512: 1511: 1492: 1491: 1477: 1476: 1475: 1471: 1469: 1466: 1465: 1458: 1452: 1432: 1418: 1413: 1386: 1354: 1353: 1351: 1348: 1347: 1341: 1333: 1319:gauge invariant 1297: 1289: 1287: 1261: 1260: 1258: 1255: 1254: 1231: 1201: 1196: 1178: 1167: 1166: 1165: 1151: 1150: 1148: 1145: 1144: 1131: 1121: 1113: 1076: 1075: 1073: 1070: 1069: 1062:electric charge 1058: 1052: 1008: 1007: 1005: 1002: 1001: 994: 986: 983: 975: 972: 964: 950: 949: 941: 931: 922: 921: 907: 902: 901: 895: 891: 882: 877: 876: 870: 866: 857: 852: 851: 845: 841: 840: 836: 826: 817: 816: 806: 798: 796: 790: 785: 784: 771: 763: 761: 755: 750: 749: 736: 728: 726: 720: 715: 714: 707: 697: 695: 692: 691: 661: 653: 640: 639: 635: 627: 624: 623: 616: 603:linear operator 574: 569: 546: 545: 543: 540: 539: 507: 505: 469: 468: 464: 451: 449: 436: 413: 411: 409: 406: 405: 401: 400:-direction and 397: 393: 346: 345: 341: 318: 315: 314: 303: 295: 256:gauge invariant 254:, which is not 242:, i.e. it is a 239: 208: 200: 198: 172: 171: 169: 166: 165: 155: 129: 124: 121: 120: 116: 106: 96: 75: 70: 47: 46: 44: 41: 40: 33:linear momentum 17: 12: 11: 5: 4276: 4266: 4265: 4248: 4247: 4244: 4243: 4241: 4240: 4235: 4229: 4227: 4223: 4222: 4220: 4219: 4214: 4209: 4204: 4198: 4196: 4192: 4191: 4189: 4188: 4182: 4180: 4176: 4175: 4173: 4172: 4167: 4162: 4156: 4154: 4150: 4149: 4147: 4146: 4144:Kinetic energy 4141: 4136: 4130: 4128: 4124: 4123: 4121: 4120: 4115: 4110: 4104: 4102: 4095: 4091: 4090: 4087: 4086: 4084: 4083: 4078: 4072: 4070: 4066: 4065: 4063: 4062: 4056: 4054: 4050: 4049: 4047: 4046: 4041: 4036: 4030: 4028: 4027:Space and time 4021: 4017: 4016: 4009: 4008: 4001: 3994: 3986: 3978: 3977: 3970: 3952: 3925:(1): 858–888. 3909: 3858:(3): 322–331. 3842: 3818: 3799: 3750: 3738: 3734: 3730: 3727: 3722: 3718: 3713: 3710: 3707: 3703: 3700: 3697: 3694: 3691: 3688: 3672: 3653: 3633: 3632: 3630: 3627: 3626: 3625: 3620: 3615: 3610: 3603: 3600: 3585: 3581: 3577: 3574: 3571: 3568: 3564: 3560: 3557: 3551: 3548: 3544: 3537: 3534: 3528: 3524: 3521: 3518: 3515: 3511: 3504: 3501: 3495: 3489: 3486: 3478: 3475: 3470: 3466: 3462: 3457: 3450: 3447: 3416: 3409: 3406: 3403: 3400: 3394: 3391: 3385: 3380: 3376: 3370: 3366: 3362: 3359: 3356: 3351: 3344: 3341: 3332: 3328: 3316:gamma matrices 3308:Dirac operator 3289:Dirac equation 3287:, such as the 3259: 3243: 3239: 3235: 3232: 3229: 3225: 3221: 3218: 3212: 3209: 3205: 3198: 3195: 3189: 3185: 3182: 3179: 3175: 3168: 3165: 3159: 3156: 3150: 3147: 3139: 3136: 3130: 3126: 3121: 3114: 3111: 3082: 3077: 3073: 3070: 3065: 3062: 3056: 3052: 3047: 3043: 3011: 3008: 2996: 2990: 2987: 2983: 2978: 2975: 2972: 2969: 2963: 2960: 2934: 2931: 2925: 2920: 2917: 2912: 2909: 2906: 2903: 2900: 2897: 2894: 2859: 2852: 2849: 2845: 2840: 2837: 2834: 2830: 2826: 2821: 2818: 2813: 2810: 2807: 2801: 2798: 2794: 2789: 2786: 2783: 2780: 2777: 2774: 2771: 2768: 2737: 2734: 2729: 2726: 2720: 2717: 2714: 2711: 2708: 2705: 2702: 2699: 2696: 2693: 2690: 2687: 2684: 2661:differentiable 2638: 2635: 2632: 2629: 2626: 2623: 2620: 2617: 2613: 2609: 2606: 2603: 2600: 2597: 2594: 2590: 2586: 2583: 2580: 2577: 2574: 2571: 2567: 2563: 2560: 2557: 2554: 2551: 2548: 2544: 2540: 2537: 2534: 2531: 2528: 2525: 2521: 2517: 2514: 2511: 2491: 2488: 2484: 2480: 2477: 2474: 2471: 2467: 2463: 2460: 2457: 2454: 2451: 2448: 2445: 2442: 2439: 2436: 2432: 2428: 2425: 2422: 2419: 2378: 2375: 2354: 2351: 2347: 2344: 2340: 2337: 2334: 2331: 2325: 2322: 2318: 2313: 2310: 2307: 2304: 2301: 2297: 2294: 2289: 2282: 2279: 2272: 2268: 2265: 2246: 2243: 2239: 2236: 2232: 2229: 2226: 2223: 2217: 2214: 2210: 2205: 2202: 2199: 2196: 2192: 2189: 2184: 2177: 2174: 2167: 2163: 2160: 2140: 2137: 2134: 2131: 2128: 2122: 2119: 2115: 2110: 2107: 2104: 2101: 2098: 2094: 2087: 2084: 2077: 2073: 2070: 2048: 2045: 2042: 2039: 2036: 2030: 2027: 2023: 2018: 2015: 2012: 2009: 2006: 2003: 1999: 1992: 1989: 1982: 1978: 1975: 1955: 1948: 1944: 1941: 1935: 1932: 1928: 1923: 1920: 1916: 1909: 1906: 1901: 1898: 1895: 1892: 1889: 1885: 1881: 1878: 1875: 1872: 1869: 1865: 1858: 1855: 1850: 1847: 1841: 1838: 1815: 1808: 1805: 1802: 1796: 1793: 1790: 1784: 1781: 1773: 1769: 1765: 1762: 1759: 1755: 1745: 1742: 1737: 1734: 1731: 1728: 1724: 1720: 1717: 1714: 1711: 1707: 1703: 1700: 1694: 1691: 1686: 1683: 1680: 1677: 1673: 1669: 1666: 1663: 1660: 1657: 1654: 1651: 1635: 1632: 1599: 1578: 1574: 1570: 1567: 1564: 1558: 1555: 1546: 1543: 1537: 1531: 1528: 1519: 1516: 1510: 1506: 1499: 1496: 1490: 1484: 1481: 1474: 1451: 1448: 1417: 1414: 1412: 1409: 1389: 1385: 1382: 1379: 1376: 1373: 1370: 1367: 1361: 1358: 1303: 1300: 1295: 1292: 1286: 1283: 1280: 1277: 1274: 1268: 1265: 1213: 1207: 1204: 1200: 1195: 1192: 1189: 1186: 1181: 1174: 1171: 1164: 1158: 1155: 1138:imaginary unit 1101: 1098: 1095: 1092: 1089: 1083: 1080: 1051: 1048: 1033: 1030: 1027: 1024: 1021: 1015: 1012: 990: 979: 968: 948: 944: 938: 935: 930: 927: 925: 923: 920: 916: 910: 905: 898: 894: 890: 885: 880: 873: 869: 865: 860: 855: 848: 844: 839: 833: 830: 825: 822: 820: 818: 812: 809: 804: 801: 793: 788: 783: 777: 774: 769: 766: 758: 753: 748: 742: 739: 734: 731: 723: 718: 713: 710: 708: 706: 703: 700: 699: 677: 674: 671: 668: 664: 660: 656: 652: 647: 644: 638: 634: 631: 615: 612: 580: 577: 573: 568: 565: 562: 559: 553: 550: 525: 522: 517: 513: 510: 504: 499: 496: 493: 490: 487: 484: 481: 476: 473: 467: 461: 457: 454: 448: 442: 439: 434: 431: 428: 425: 422: 419: 416: 381: 376: 373: 370: 367: 364: 361: 358: 353: 350: 344: 340: 337: 334: 331: 328: 325: 322: 302: 299: 294: 291: 246:, just as the 230:In a basis of 214: 211: 206: 203: 197: 194: 191: 188: 185: 179: 176: 139: 136: 132: 128: 113:imaginary unit 81: 78: 74: 69: 66: 63: 60: 54: 51: 15: 9: 6: 4: 3: 2: 4275: 4264: 4261: 4260: 4258: 4239: 4236: 4234: 4231: 4230: 4228: 4224: 4218: 4215: 4213: 4210: 4208: 4205: 4203: 4200: 4199: 4197: 4193: 4187: 4184: 4183: 4181: 4177: 4171: 4168: 4166: 4163: 4161: 4158: 4157: 4155: 4151: 4145: 4142: 4140: 4137: 4135: 4132: 4131: 4129: 4125: 4119: 4116: 4114: 4111: 4109: 4106: 4105: 4103: 4099: 4096: 4092: 4082: 4079: 4077: 4074: 4073: 4071: 4067: 4061: 4058: 4057: 4055: 4051: 4045: 4042: 4040: 4037: 4035: 4034:d'Alembertian 4032: 4031: 4029: 4025: 4022: 4018: 4014: 4007: 4002: 4000: 3995: 3993: 3988: 3987: 3984: 3973: 3967: 3963: 3956: 3948: 3944: 3940: 3936: 3932: 3928: 3924: 3921:(in German). 3920: 3913: 3905: 3899: 3891: 3887: 3883: 3879: 3875: 3871: 3866: 3861: 3857: 3853: 3846: 3839: 3835: 3831: 3828: 3822: 3816: 3812: 3808: 3803: 3795: 3791: 3786: 3781: 3777: 3773: 3769: 3765: 3761: 3754: 3736: 3728: 3720: 3711: 3708: 3705: 3701: 3698: 3695: 3689: 3686: 3676: 3670: 3669:0-07-145546-9 3666: 3662: 3657: 3651: 3647: 3643: 3638: 3634: 3624: 3621: 3619: 3616: 3614: 3611: 3609: 3606: 3605: 3599: 3583: 3572: 3569: 3566: 3562: 3555: 3549: 3535: 3532: 3526: 3519: 3516: 3513: 3509: 3493: 3484: 3476: 3473: 3468: 3464: 3460: 3455: 3445: 3428: 3414: 3401: 3398: 3389: 3383: 3378: 3368: 3364: 3357: 3354: 3349: 3339: 3330: 3326: 3317: 3313: 3309: 3304: 3302: 3298: 3294: 3290: 3286: 3281: 3274: 3268: 3262: 3241: 3230: 3227: 3223: 3216: 3210: 3196: 3193: 3187: 3180: 3177: 3173: 3157: 3154: 3145: 3137: 3134: 3128: 3124: 3119: 3109: 3097: 3080: 3071: 3068: 3063: 3060: 3054: 3050: 3045: 3041: 3032: 3025: 3021: 3017: 3007: 2994: 2988: 2985: 2981: 2973: 2970: 2967: 2958: 2929: 2923: 2915: 2910: 2907: 2904: 2898: 2892: 2884: 2880: 2876: 2871: 2857: 2850: 2847: 2843: 2835: 2832: 2828: 2824: 2816: 2811: 2808: 2805: 2799: 2796: 2792: 2787: 2784: 2781: 2778: 2772: 2766: 2754: 2753:infinitesimal 2735: 2732: 2727: 2724: 2718: 2715: 2709: 2703: 2700: 2694: 2691: 2688: 2682: 2670: 2669:Taylor series 2666: 2665:complex plane 2662: 2658: 2649: 2633: 2630: 2627: 2621: 2615: 2607: 2604: 2601: 2598: 2592: 2584: 2581: 2578: 2569: 2561: 2558: 2555: 2552: 2546: 2538: 2529: 2526: 2523: 2515: 2512: 2509: 2502:that becomes 2486: 2478: 2469: 2458: 2452: 2449: 2446: 2443: 2440: 2434: 2423: 2417: 2403: 2399: 2394: 2388: 2384: 2374: 2372: 2352: 2345: 2342: 2338: 2335: 2329: 2323: 2320: 2316: 2308: 2305: 2302: 2295: 2292: 2277: 2266: 2244: 2237: 2234: 2230: 2227: 2221: 2215: 2212: 2208: 2200: 2197: 2190: 2187: 2172: 2161: 2138: 2132: 2126: 2120: 2117: 2113: 2105: 2102: 2096: 2082: 2071: 2059: 2046: 2040: 2034: 2028: 2025: 2021: 2013: 2010: 2007: 2001: 1987: 1976: 1953: 1942: 1933: 1930: 1926: 1918: 1907: 1904: 1899: 1893: 1890: 1887: 1879: 1873: 1867: 1856: 1853: 1848: 1845: 1836: 1813: 1803: 1800: 1791: 1779: 1767: 1763: 1760: 1757: 1753: 1743: 1740: 1735: 1732: 1726: 1718: 1709: 1701: 1692: 1689: 1684: 1681: 1675: 1667: 1661: 1655: 1649: 1641: 1631: 1629: 1625: 1621: 1618: 1614: 1613:unit operator 1576: 1565: 1562: 1553: 1541: 1535: 1526: 1514: 1508: 1504: 1494: 1488: 1479: 1472: 1463: 1457: 1447: 1445: 1441: 1438: 1429: 1427: 1423: 1408: 1406: 1401: 1383: 1380: 1371: 1368: 1365: 1344: 1339: 1331: 1327: 1322: 1320: 1301: 1293: 1281: 1278: 1275: 1272: 1263: 1252: 1249: 1245: 1244:wave function 1241: 1237: 1229: 1224: 1211: 1205: 1190: 1187: 1184: 1179: 1169: 1162: 1153: 1141: 1139: 1134: 1129: 1124: 1119: 1093: 1090: 1087: 1067: 1063: 1057: 1047: 1044: 1025: 1022: 1019: 999: 993: 989: 982: 978: 971: 967: 946: 933: 928: 926: 918: 914: 908: 896: 892: 888: 883: 871: 867: 863: 858: 846: 842: 837: 828: 823: 821: 810: 802: 791: 781: 775: 767: 756: 746: 740: 732: 721: 711: 709: 704: 672: 669: 666: 658: 642: 636: 632: 629: 621: 611: 608: 607:superposition 604: 599: 597: 578: 563: 560: 557: 548: 536: 523: 520: 511: 508: 502: 494: 491: 488: 485: 482: 471: 465: 455: 452: 446: 440: 429: 426: 423: 417: 379: 371: 368: 365: 362: 359: 348: 342: 338: 332: 329: 326: 320: 312: 308: 301:One dimension 298: 290: 288: 287:Eugene Wigner 284: 280: 276: 271: 269: 265: 261: 257: 253: 249: 245: 237: 233: 232:Hilbert space 228: 212: 204: 192: 189: 186: 183: 174: 162: 158: 153: 137: 130: 114: 109: 104: 99: 79: 64: 61: 58: 49: 38: 34: 30: 26: 22: 4202:Displacement 4134:Total energy 4107: 3961: 3955: 3922: 3918: 3912: 3898:cite journal 3855: 3851: 3845: 3821: 3806: 3802: 3770:(12): 8287. 3767: 3764:Scholarpedia 3763: 3753: 3675: 3660: 3656: 3641: 3637: 3429: 3305: 3279: 3272: 3260: 3095: 3094:obtains the 3013: 2872: 2650: 2401: 2397: 2390: 2060: 1637: 1459: 1430: 1426:normalizable 1419: 1402: 1342: 1323: 1246:undergoes a 1225: 1142: 1132: 1122: 1059: 1045: 998:unit vectors 991: 987: 980: 976: 969: 965: 617: 600: 537: 309:solution to 304: 296: 272: 229: 160: 156: 107: 97: 24: 18: 4139:Hamiltonian 4101:Fundamental 3312:Dirac slash 2883:translation 2395:is denoted 2369:stands for 1416:Hermiticity 1238:, during a 236:eigenstates 4060:C-symmetry 3629:References 3291:and other 3269:, and the 3267:4-gradient 3020:4-momentum 2755:values of 2381:See also: 1617:Heisenberg 1462:commutator 1433:[0, ∞) 1411:Properties 1120:operator, 1054:See also: 596:eigenvalue 307:plane wave 275:Niels Bohr 4053:Particles 3947:1434-6001 3794:1941-6016 3726:⟨ 3717:∂ 3696:∫ 3693:ℏ 3687:− 3598:instead. 3584:μ 3580:∂ 3576:ℏ 3570:− 3559:∇ 3547:∂ 3543:∂ 3523:ℏ 3517:− 3503:^ 3488:^ 3469:− 3456:μ 3449:^ 3408:∂ 3405:ℏ 3393:^ 3379:μ 3375:∂ 3369:μ 3365:γ 3361:ℏ 3350:μ 3343:^ 3331:μ 3327:γ 3242:μ 3238:∂ 3234:ℏ 3220:∇ 3208:∂ 3204:∂ 3184:ℏ 3167:^ 3158:− 3149:^ 3120:μ 3113:^ 3072:− 3046:μ 3018:into the 2977:ℏ 2971:− 2962:^ 2933:^ 2924:ε 2919:ℏ 2911:− 2899:ε 2839:ℏ 2833:− 2825:ε 2820:ℏ 2812:− 2788:ε 2785:− 2773:ε 2728:ψ 2719:ε 2716:− 2704:ψ 2695:ε 2692:− 2683:ψ 2634:ε 2631:− 2622:ψ 2619:⟩ 2602:∫ 2596:⟩ 2593:ψ 2585:ε 2582:− 2576:⟨ 2573:⟩ 2556:∫ 2550:⟩ 2547:ψ 2536:⟨ 2533:⟩ 2530:ε 2510:∫ 2490:⟩ 2487:ψ 2476:⟨ 2473:⟩ 2459:ε 2444:∫ 2438:⟩ 2435:ψ 2424:ε 2339:− 2330:δ 2312:ℏ 2306:− 2300:⟩ 2281:^ 2264:⟨ 2231:− 2222:δ 2204:ℏ 2195:⟩ 2176:^ 2159:⟨ 2127:ψ 2109:ℏ 2100:⟩ 2097:ψ 2086:^ 2069:⟨ 2035:ψ 2017:ℏ 2011:− 2005:⟩ 2002:ψ 1991:^ 1974:⟨ 1940:⟨ 1922:⟩ 1900:∫ 1897:ℏ 1891:− 1877:⟨ 1871:⟩ 1849:∫ 1840:^ 1807:ℏ 1804:π 1783:~ 1780:ψ 1772:ℏ 1736:∫ 1730:⟩ 1727:ψ 1716:⟨ 1713:⟩ 1699:⟨ 1685:∫ 1679:⟩ 1676:ψ 1665:⟨ 1650:ψ 1569:ℏ 1557:^ 1545:^ 1536:− 1530:^ 1518:^ 1498:^ 1483:^ 1381:− 1378:∇ 1375:ℏ 1369:− 1360:^ 1299:∂ 1294:ψ 1291:∂ 1285:ℏ 1279:− 1273:ψ 1267:^ 1203:∂ 1199:∂ 1194:ℏ 1188:− 1173:^ 1157:^ 1100:∇ 1097:ℏ 1091:− 1082:^ 1032:∇ 1029:ℏ 1023:− 1014:^ 947:ψ 937:ℏ 919:ψ 832:ℏ 808:∂ 803:ψ 800:∂ 773:∂ 768:ψ 765:∂ 738:∂ 733:ψ 730:∂ 705:ψ 702:∇ 667:− 659:⋅ 646:ℏ 630:ψ 576:∂ 572:∂ 567:ℏ 561:− 552:^ 521:ψ 516:ℏ 489:− 475:ℏ 460:ℏ 438:∂ 418:ψ 415:∂ 366:− 352:ℏ 321:ψ 210:∂ 205:ψ 202:∂ 196:ℏ 190:− 184:ψ 178:^ 135:∂ 127:∂ 77:∂ 73:∂ 68:ℏ 62:− 53:^ 4257:Category 4118:Rotation 4113:Position 4108:Momentum 3890:16949018 3830:Archived 3712:⟩ 3602:See also 3276:becomes 2879:momentum 2657:analytic 2406:, where 2346:′ 2296:′ 2238:′ 2191:′ 1624:position 1118:gradient 996:are the 29:operator 4217:Squeeze 4165:Orbital 4094:Quantum 4020:General 3927:Bibcode 3870:Bibcode 3772:Bibcode 3265:is the 2751:so for 1611:is the 1437:unitary 1136:is the 1126:is the 1116:is the 1064:and no 101:is the 27:is the 4195:Optics 4127:Energy 4039:Parity 3968:  3945:  3888:  3813:  3792:  3667:  3648:  3256:where 3024:1-form 3022:(as a 2877:, the 2671:about 2659:(i.e. 2655:to be 2365:where 1951:  1911:  1860:  1747:  1696:  1615:. The 1589:where 1442:. See 1340:  1332:  1234:in an 1130:, and 1112:where 985:, and 963:where 392:where 285:, and 95:where 23:, the 4160:Total 3886:S2CID 3860:arXiv 3026:with 2948:thus 1444:below 1248:local 4170:Spin 4044:Time 3966:ISBN 3943:ISSN 3904:link 3825:See 3811:ISBN 3790:ISSN 3665:ISBN 3646:ISBN 3310:and 3306:The 3299:for 2391:The 2385:and 1336:and 1324:The 1251:U(1) 1066:spin 111:the 3935:doi 3878:doi 3780:doi 3033:): 1446:.) 620:del 19:In 4259:: 3941:. 3933:. 3923:34 3900:}} 3896:{{ 3884:. 3876:. 3868:. 3856:69 3854:. 3788:. 3778:. 3766:. 3762:. 3318:: 3303:. 3280:iħ 3273:iħ 3098:: 2759:: 2675:: 2373:. 1630:. 1346:: 1140:. 974:, 281:, 277:, 270:. 161:dx 115:, 105:, 4005:e 3998:t 3991:v 3974:. 3949:. 3937:: 3929:: 3906:) 3892:. 3880:: 3872:: 3862:: 3796:. 3782:: 3774:: 3768:3 3737:. 3733:| 3729:x 3721:x 3709:x 3706:| 3702:x 3699:d 3690:i 3573:i 3567:= 3563:) 3556:, 3550:t 3536:c 3533:1 3527:( 3520:i 3514:= 3510:) 3500:p 3494:, 3485:E 3477:c 3474:1 3465:( 3461:= 3446:P 3415:/ 3402:i 3399:= 3390:P 3384:= 3358:i 3355:= 3340:P 3278:+ 3271:− 3261:μ 3258:∂ 3231:i 3228:= 3224:) 3217:, 3211:t 3197:c 3194:1 3188:( 3181:i 3178:= 3174:) 3164:p 3155:, 3146:E 3138:c 3135:1 3129:( 3125:= 3110:P 3081:) 3076:p 3069:, 3064:c 3061:E 3055:( 3051:= 3042:P 2995:. 2989:x 2986:d 2982:d 2974:i 2968:= 2959:p 2930:p 2916:i 2908:1 2905:= 2902:) 2896:( 2893:T 2858:) 2851:x 2848:d 2844:d 2836:i 2829:( 2817:i 2809:1 2806:= 2800:x 2797:d 2793:d 2782:1 2779:= 2776:) 2770:( 2767:T 2757:ε 2736:x 2733:d 2725:d 2713:) 2710:x 2707:( 2701:= 2698:) 2689:x 2686:( 2673:x 2653:ψ 2637:) 2628:x 2625:( 2616:x 2612:| 2608:x 2605:d 2599:= 2589:| 2579:x 2570:x 2566:| 2562:x 2559:d 2553:= 2543:| 2539:x 2527:+ 2524:x 2520:| 2516:x 2513:d 2483:| 2479:x 2470:x 2466:| 2462:) 2456:( 2453:T 2450:x 2447:d 2441:= 2431:| 2427:) 2421:( 2418:T 2408:ε 2404:) 2402:ε 2400:( 2398:T 2367:δ 2353:, 2350:) 2343:x 2336:x 2333:( 2324:x 2321:d 2317:d 2309:i 2303:= 2293:x 2288:| 2278:p 2271:| 2267:x 2245:, 2242:) 2235:p 2228:p 2225:( 2216:p 2213:d 2209:d 2201:i 2198:= 2188:p 2183:| 2173:x 2166:| 2162:p 2139:, 2136:) 2133:p 2130:( 2121:p 2118:d 2114:d 2106:i 2103:= 2093:| 2083:x 2076:| 2072:p 2047:. 2044:) 2041:x 2038:( 2029:x 2026:d 2022:d 2014:i 2008:= 1998:| 1988:p 1981:| 1977:x 1954:, 1947:| 1943:x 1934:x 1931:d 1927:d 1919:x 1915:| 1908:x 1905:d 1894:i 1888:= 1884:| 1880:p 1874:p 1868:p 1864:| 1857:p 1854:d 1846:= 1837:p 1814:, 1801:2 1795:) 1792:p 1789:( 1768:/ 1764:p 1761:x 1758:i 1754:e 1744:p 1741:d 1733:= 1723:| 1719:p 1710:p 1706:| 1702:x 1693:p 1690:d 1682:= 1672:| 1668:x 1662:= 1659:) 1656:x 1653:( 1598:I 1577:, 1573:I 1566:i 1563:= 1554:x 1542:p 1527:p 1515:x 1509:= 1505:] 1495:p 1489:, 1480:x 1473:[ 1388:A 1384:q 1372:i 1366:= 1357:P 1343:A 1334:φ 1302:x 1282:i 1276:= 1264:p 1232:q 1212:. 1206:x 1191:i 1185:= 1180:x 1170:p 1163:= 1154:p 1133:i 1123:ħ 1114:∇ 1094:i 1088:= 1079:p 1026:i 1020:= 1011:p 992:z 988:e 981:y 977:e 970:x 966:e 943:p 934:i 929:= 915:) 909:z 904:e 897:z 893:p 889:+ 884:y 879:e 872:y 868:p 864:+ 859:x 854:e 847:x 843:p 838:( 829:i 824:= 811:z 792:z 787:e 782:+ 776:y 757:y 752:e 747:+ 741:x 722:x 717:e 712:= 676:) 673:t 670:E 663:r 655:p 651:( 643:i 637:e 633:= 579:x 564:i 558:= 549:p 524:. 512:p 509:i 503:= 498:) 495:t 492:E 486:x 483:p 480:( 472:i 466:e 456:p 453:i 447:= 441:x 433:) 430:t 427:, 424:x 421:( 402:E 398:x 394:p 380:, 375:) 372:t 369:E 363:x 360:p 357:( 349:i 343:e 339:= 336:) 333:t 330:, 327:x 324:( 240:p 213:x 193:i 187:= 175:p 159:/ 157:d 154:( 138:x 131:/ 117:x 108:i 98:ħ 80:x 65:i 59:= 50:p

Index

quantum mechanics
operator
linear momentum
differential operator
reduced Planck constant
imaginary unit
total derivative
Hilbert space
eigenstates
multiplication operator
position operator
canonical momentum
gauge invariant
electromagnetic field
canonical momentum
kinetic momentum
Niels Bohr
Arnold Sommerfeld
Erwin Schrödinger
Eugene Wigner
plane wave
Schrödinger's equation
eigenvalue
linear operator
superposition
del
unit vectors
Position and momentum space
electric charge
spin

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