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Release 17bSeptember 2015
NIST Standard Reference Database 101
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XIXIndex of properties
XXH-bond dimers
XXIOddities

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III.B.3.b. (XIII.C.2.)

Vibrational frequency scaling factors

Calculated vibrational frequencies ("theory" in table) are calculated at CCD/6-31G**

Scale factor How many Source
Molecules Vibrations
0.938 ± 0.023 53 468 cccbdb
Jump to histogram
Formula Name Mode Symmetry Frequency Count
Theory Experiment ratio molecules vibrations
CH4 Methane 1 A1 3115 2917 0.936 1 1
    2 E 1618 1534 0.948 1 2
    3 T2 3249 3019 0.929 1 3
    4 T2 1408 1306 0.928 1 4
CH3NH2 methyl amine 1 A' 3580 3361 0.939 2 5
    2 A' 3166 2961 0.935 2 6
    3 A' 3072 2820 0.918 2 7
    4 A' 1719 1623 0.944 2 8
    5 A' 1562 1473 0.943 2 9
    6 A' 1517 1430 0.943 2 10
    7 A' 1224 1130 0.923 2 11
    8 A' 1102 1044 0.948 2 12
    9 A' 904 780 0.862 2 13
    10 A" 3670 3427 0.934 2 14
    11 A" 3207 2985 0.931 2 15
    12 A" 1581 1485 0.940 2 16
    13 A" 1398 1335 0.955 2 17
    14 A" 999     2 18
    15 A" 337 268 0.795 2 19
CH3CH2NH2 Ethylamine 11 A' 1116 1086 0.973 3 20
    12 A' 944 892 0.945 3 21
    13 A' 907 773 0.852 3 22
    14 A' 412 403 0.978 3 23
    15 A" 3654 3412 0.934 3 24
    16 A" 3194 2924 0.916 3 25
    17 A" 3164 2906 0.918 3 26
    18 A" 1558 1455 0.934 3 27
    19 A" 1432 1238 0.864 3 28
    20 A" 1320 1293 0.980 3 29
    21 A" 1036 1117 1.078 3 30
    22 A" 797 816 1.024 3 31
    23 A" 318 259 0.815 3 32
    24 A" 270 218 0.807 3 33
HNCO Isocyanic acid 1 A' 3801 3538 0.931 4 34
    2 A' 2386 2269 0.951 4 35
    3 A' 1363 1327 0.973 4 36
    4 A' 811 777 0.957 4 37
    5 A' 561 577 1.029 4 38
    6 A" 624 656 1.051 4 39
CH3COOCH3 methyl acetate 9 A' 1464 1375 0.939 5 40
    10 A' 1346 1248 0.927 5 41
    11 A' 1249 1159 0.928 5 42
    12 A' 1132 1060 0.937 5 43
    13 A' 1027 980 0.954 5 44
    14 A' 893 844 0.945 5 45
    15 A' 661 639 0.966 5 46
    16 A' 433 429 0.992 5 47
    17 A' 295 303 1.028 5 48
    18 A" 3230 3005 0.930 5 49
    19 A" 3224 2994 0.929 5 50
    20 A" 1551 1460 0.941 5 51
    21 A" 1538 1430 0.930 5 52
    22 A" 1214 1187 0.978 5 53
    23 A" 1103 1036 0.939 5 54
    24 A" 614 607 0.989 5 55
    25 A" 182 187 1.028 5 56
    26 A" 155 136 0.878 5 57
    27 A" 83 110 1.327 5 58
CH2CHCH3 Propene 11 A' 1228 1171 0.954 6 59
    12 A' 974 963 0.989 6 60
    13 A' 956 920 0.963 6 61
    14 A' 430 428 0.995 6 62
    15 A" 3179 2954 0.929 6 63
    16 A" 1543 1443 0.935 6 64
    17 A" 1104 1045 0.947 6 65
    18 A" 1040 991 0.953 6 66
    19 A" 942 912 0.968 6 67
    20 A" 591 578 0.978 6 68
    21 A" 194 174 0.896 6 69
CH3CH2CHO Propanal 18 A" 1558 1451 0.931 7 70
    19 A" 1324 1250 0.944 7 71
    20 A" 1189 1118 0.940 7 72
    21 A" 927 892 0.962 7 73
    22 A" 702 660 0.940 7 74
    23 A" 242 220 0.909 7 75
    24 A" 136 135 0.992 7 76
C5H8 Cyclopentene 30 A" 950 937 0.986 8 77
    31 A" 924 800 0.866 8 78
    32 A" 790 702 0.889 8 79
    33 A" 392 387 0.986 8 80
C4H4N2 Pyrazine 20 B3g 1637 1525 0.932 9 81
    21 B3g 1409 1346 0.955 9 82
    22 B3g 726 704 0.969 9 83
    23 B3u 817 785 0.960 9 84
    24 B3u 433 418 0.965 9 85
CH3CHCHCH3 2-Butene, (Z)- 17 A 3176 2965 0.934 10 86
    18 A 1549 1448 0.935 10 87
    19 A 1104 986 0.893 10 88
    20 A 712 673 0.945 10 89
    22 A 3220 3033 0.942 10 90
    23 A 3205 2965 0.925 10 91
    24 A 3111 2900 0.932 10 92
    25 A 1553 1448 0.933 10 93
    26 A 1495 1420 0.950 10 94
    27 A 1442 1397 0.969 10 95
    28 A 1191 1135 0.953 10 96
    29 A 1014 986 0.973 10 97
    30 A 573 583 1.017 10 98
C5H8 1,4-Pentadiene 17 A 87 102 1.170 11 99
    18 A 3317 3080 0.929 11 100
    19 A 3232 3012 0.932 11 101
    20 A 3220 3012 0.935 11 102
    21 A 3150 2982 0.947 11 103
    22 A 1761 1640 0.931 11 104
    23 A 1509 1413 0.937 11 105
    24 A 1370 1314 0.959 11 106
    25 A 1342 1280 0.954 11 107
    26 A 1208 1060 0.878 11 108
    27 A 1043 995 0.954 11 109
    28 A 1001 995 0.994 11 110
    29 A 949 920 0.970 11 111
    30 A 920 760 0.826 11 112
    31 A 615 721 1.172 11 113
    32 A 457 421 0.921 11 114
    33 A 97 331 3.429 11 115
    16 A 302 137 0.453 11 116
    15 A 378 421 1.115 11 117
    14 A 686 562 0.819 11 118
    13 A 939 876 0.932 11 119
    12 A 949 918 0.967 11 120
    11 A 1041 995 0.956 11 121
    10 A 1115 1120 1.004 11 122
    9 A 1300 1263 0.971 11 123
    8 A 1355 1295 0.956 11 124
    7 A 1502 1413 0.941 11 125
C5H6 1,3-Cyclopentadiene 27 B2 825 805 0.976 12 126
    26 B2 1006 959 0.954 12 127
    25 B2 1151 1090 0.947 12 128
    24 B2 1327 1239 0.934 12 129
    23 B2 1370 1292 0.943 12 130
    22 B2 1703 1580 0.928 12 131
    21 B2 3280 3043 0.928 12 132
    20 B2 3306 3105 0.939 12 133
    19 B1 344 350 1.017 12 134
    18 B1 689 664 0.964 12 135
    17 B1 949 891 0.939 12 136
    16 B1 966 925 0.958 12 137
    15 B1 3150 2900 0.921 12 138
CH3CHCHCH3 2-Butene, (E)- 26 A 1476 1393 0.944 13 139
    27 A 1374 1311 0.954 13 140
    28 A 1117 1072 0.959 13 141
    29 A 1018 987 0.969 13 142
    30 A 286 261 0.913 13 143
C5H6 1,3-Cyclopentadiene 14 A2 508 516 1.016 14 144
    13 A2 724 700 0.967 14 145
    12 A2 925 941 1.017 14 146
    11 A2 1167 1100 0.943 14 147
    10 A1 820 802 0.978 14 148
    9 A1 956 915 0.957 14 149
    8 A1 1039 994 0.957 14 150
CH3SSCH3 Disulfide, dimethyl 8 A 1022 949 0.929 15 151
    9 A 748 694 0.928 15 152
    10 A 524 509 0.972 15 153
    11 A 241 240 0.997 15 154
    12 A 160 134 0.838 15 155
    13 A 97 117 1.206 15 156
    14 B 3242 2990 0.922 15 157
    15 B 3228 2983 0.924 15 158
    16 B 3131 2915 0.931 15 159
    17 B 1543 1430 0.927 15 160
    18 B 1518 1415 0.932 15 161
    19 B 1428 1303 0.912 15 162
    20 B 1027 955 0.930 15 163
    21 B 1020 949 0.930 15 164
    22 B 743 691 0.930 15 165
    23 B 271 274 1.011 15 166
    24 B 171 134 0.785 15 167
H2 Hydrogen diatomic 1 Σg 4519 4401 0.974 16 168
CF2 Difluoromethylene 1 A1 1297 1225 0.945 17 169
    2 A1 673 667 0.991 17 170
    3 B2 1201 1114 0.928 17 171
C5H6 1,3-Cyclopentadiene 7 A1 1166 1106 0.948 18 172
    6 A1 1455 1365 0.938 18 173
    5 A1 1496 1378 0.921 18 174
    4 A1 1633 1500 0.919 18 175
    3 A1 3109 2886 0.928 18 176
    2 A1 3289 3075 0.935 18 177
    1 A1 3314 3091 0.933 18 178
C8H8 cubane 18 T2u 870 829 0.953 19 179
    17 T2u 1121 1036 0.924 19 180
    16 T2g 674 665 0.987 19 181
    15 T2g 866 821 0.948 19 182
    14 T2g 1266 1182 0.934 19 183
    13 T2g 3201 2970 0.928 19 184
    12 T1u 891 853 0.957 19 185
C3H4 cyclopropene 9 B1 3216 2995 0.931 20 186
    10 B1 1148 1088 0.947 20 187
    11 B1 587 569 0.969 20 188
    12 B2 3347 3124 0.933 20 189
    13 B2 1130 1043 0.923 20 190
    14 B2 1093 1011 0.925 20 191
    15 B2 831 769 0.926 20 192
CS carbon monosulfide 1 Σ 1364 1285 0.942 21 193
CH Methylidyne 1 Σ 2885 2861 0.992 22 194
C8H8 cubane 11 T1u 1319 1230 0.932 23 195
OH Hydroxyl radical 1 Σ 3807 3738 0.982 24 196
C8H8 cubane 10 T1u 3208 2978 0.928 25 197
    9 T1g 1189 1130 0.950 25 198
    8 Eu 615 617 1.004 25 199
    7 Eu 1164 1151 0.989 25 200
    6 Eg 946 912 0.964 25 201
    5 Eg 1167 1083 0.928 25 202
    4 A2u 1037 839 0.809 25 203
SiH2Cl2 dichlorosilane 8 B2 928 876 0.944 26 204
    9 B2 614 590 0.962 26 205
LiH Lithium Hydride 1 Σ 1385 1405 1.015 27 206
NaH sodium hydride 1 Σ 1158 1172 1.012 28 207
HCl Hydrogen chloride 1 Σ 3081 2991 0.971 29 208
HF Hydrogen fluoride 1 Σ 4211 4138 0.983 30 209
NH3 Ammonia 1 A1 3551 3337 0.940 31 210
    2 A1 1141 950 0.832 31 211
    3 E 3692 3444 0.933 31 212
    4 E 1734 1627 0.938 31 213
MgH2 magnesium dihydride 2 Σu 1630 1572 0.964 32 214
    3 Πu 447 440 0.983 32 215
C8H8 cubane 3 A2u 3192 2978 0.933 33 216
H2O Water 2 A1 1702 1595 0.937 34 217
    3 B2 4034 3756 0.931 34 218
H2S Hydrogen sulfide 1 A1 2794 2615 0.936 35 219
    2 A1 1270 1183 0.931 35 220
    3 B2 2816 2626 0.932 35 221
AlH3 aluminum trihydride 1 A1' 1973 1900 0.963 36 222
    2 A2" 728 698 0.958 36 223
    3 E' 1987 1883 0.947 36 224
    4 E' 813 783 0.963 36 225
BeH2 beryllium dihydride 2 Σu 2308 2159 0.935 37 226
    3 Πu 727 698 0.960 37 227
PH3 Phosphine 1 A1 2485 2323 0.935 38 228
    2 A1 1076 992 0.922 38 229
    3 E 2499 2328 0.932 38 230
    4 E 1169 1118 0.956 38 231
SiH4 Silane 1 A1 2309 2187 0.947 39 232
    2 E 1004 975 0.971 39 233
    3 T2 2322 2191 0.944 39 234
    4 T2 962 914 0.950 39 235
LiO lithium oxide 1 Σ 856 815 0.952 40 236
NaO sodium monoxide 1 Σ 502 492 0.982 41 237
BH3 boron trihydride 2 A2" 1198 1148 0.958 42 238
    3 E' 2789 2602 0.933 42 239
    4 E' 1262 1197 0.948 42 240
BeH beryllium monohydride 1 Σ 2115 2061 0.974 43 241
PH2 Phosphino radical 1 A1 2455 2310 0.941 44 242
    2 A1 1175 1102 0.938 44 243
SiH3 Silyl radical 1 A1 2282 2136 0.936 45 244
    2 A1 806 728 0.903 45 245
    3 E 2319 2185 0.942 45 246
    4 E 971 922 0.949 45 247
BH Boron monohydride 1 Σ 2408 2367 0.983 46 248
C8H8 cubane 2 A1g 1050 1002 0.954 47 249
    1 A1g 3226 2995 0.928 47 250
C5H8 Cyclopentene 29 A" 975 1082 1.110 48 251
    28 A" 1078 1113 1.032 48 252
    27 A" 1187 1207 1.017 48 253
    26 A" 1269 1297 1.022 48 254
    25 A" 1354 1302 0.962 48 255
    24 A" 1380 1356 0.983 48 256
    23 A" 1432 1432 1.000 48 257
    22 A" 1556 1467 0.943 48 258
    21 A" 3102 2927 0.944 48 259
    20 A" 3156 2967 0.940 48 260
    19 A" 3264 3039 0.931 48 261
    18 A' 169 254 1.504 48 262
    17 A' 614 603 0.982 48 263
    16 A' 730 692 0.947 48 264
    15 A' 856 904 1.056 48 265
    14 A' 940 962 1.023 48 266
    13 A' 1007 964 0.957 48 267
    12 A' 1106 1048 0.947 48 268
    11 A' 1165 1213 1.041 48 269
    10 A' 1276 1284 1.006 48 270
    9 A' 1389 1302 0.938 48 271
    8 A' 1546 1449 0.937 48 272
    7 A' 1573 1467 0.932 48 273
    6 A' 1734 1616 0.932 48 274
    5 A' 3102 2852 0.920 48 275
    4 A' 3133 2902 0.926 48 276
    3 A' 3158 2916 0.923 48 277
    2 A' 3192 2958 0.927 48 278
    1 A' 3289 3066 0.932 48 279
C4H9N Pyrrolidine 36 A" 65 65 1.003 49 280
    35 A" 643 600 0.934 49 281
    34 A" 896 848 0.946 49 282
    33 A" 967 883 0.913 49 283
    32 A" 1138 1023 0.899 49 284
    31 A" 1173 1099 0.937 49 285
    30 A" 1241 1171 0.943 49 286
    29 A" 1289 1203 0.934 49 287
    28 A" 1351 1211 0.897 49 288
    27 A" 1374 1268 0.923 49 289
    26 A" 1484 1341 0.904 49 290
    25 A" 1547 1412 0.913 49 291
    24 A" 1577 1459 0.925 49 292
    23 A" 3033 2818 0.929 49 293
    22 A" 3142 2879 0.916 49 294
    21 A" 3165 2916 0.921 49 295
    20 A" 3189 2967 0.930 49 296
    19 A' 305 299 0.982 49 297
    18 A' 595 579 0.973 49 298
    17 A' 794 789 0.994 49 299
    16 A' 921 832 0.904 49 300
    15 A' 937 871 0.929 49 301
    14 A' 978 901 0.921 49 302
    13 A' 1037 920 0.887 49 303
    12 A' 1108 974 0.879 49 304
    11 A' 1270 1181 0.930 49 305
    10 A' 1292 1228 0.951 49 306
    9 A' 1371 1273 0.929 49 307
    8 A' 1452 1292 0.890 49 308
    7 A' 1569 1447 0.922 49 309
    6 A' 1594 1484 0.931 49 310
    5 A' 3037 2824 0.930 49 311
    4 A' 3151 2889 0.917 49 312
    3 A' 3170 2927 0.923 49 313
    2 A' 3207 2975 0.928 49 314
    1 A' 3612 3356 0.929 49 315
CH3CH2CHO Propanal 17 A" 3142 2942 0.936 50 316
    16 A" 3225 2992 0.928 50 317
    15 A' 269 271 1.008 50 318
    14 A' 686 668 0.974 50 319
    13 A' 893 848 0.950 50 320
    12 A' 1036 993 0.959 50 321
    11 A' 1152 1093 0.949 50 322
    10 A' 1427 1335 0.936 50 323
    9 A' 1465 1376 0.939 50 324
    8 A' 1485 1390 0.936 50 325
    7 A' 1525 1416 0.928 50 326
    6 A' 1561 1460 0.935 50 327
    5 A' 1873 1743 0.931 50 328
    4 A' 3015 2809 0.932 50 329
    3 A' 3104 2895 0.933 50 330
    2 A' 3134 2904 0.927 50 331
    1 A' 3219 2981 0.926 50 332
CH2CHCH3 Propene 10 A' 1361 1297 0.953 51 333
    9 A' 1467 1378 0.939 51 334
    8 A' 1509 1420 0.941 51 335
    7 A' 1559 1470 0.943 51 336
    6 A' 1771 1650 0.932 51 337
    5 A' 3109 2871 0.924 51 338
    4 A' 3202 2954 0.923 51 339
    3 A' 3222 2991 0.928 51 340
    2 A' 3233 3013 0.932 51 341
    1 A' 3318 3090 0.931 51 342
CH3COOCH3 methyl acetate 8 A' 1530 1430 0.934 52 343
    7 A' 1538 1440 0.936 52 344
    6 A' 1562 1460 0.935 52 345
    5 A' 1902 1771 0.931 52 346
    4 A' 3140 2964 0.944 52 347
    3 A' 3142 2966 0.944 52 348
    2 A' 3258 3031 0.930 52 349
    1 A' 3262 3035 0.930 52 350
CH3CH2NH2 Ethylamine 10 A' 1198 1016 0.848 53 351
    9 A' 1433 1397 0.975 53 352
    8 A' 1473 1378 0.935 53 353
    7 A' 1550 1465 0.945 53 354
    6 A' 1568 1487 0.948 53 355
    5 A' 1716 1622 0.945 53 356
    4 A' 3105 2860 0.921 53 357
    3 A' 3123 2840 0.909 53 358
    2 A' 3193 2985 0.935 53 359
    1 A' 3563 3345 0.939 53 360
CH3CHCHCH3 2-Butene, (E)- 1 A 3214 3011 0.937 54 361
    2 A 3199 2954 0.923 54 362
    3 A 3106 2874 0.925 54 363
    4 A 1804 1680 0.931 54 364
    5 A 1556 1457 0.936 54 365
    6 A 1477 1385 0.938 54 366
    7 A 1369 1309 0.956 54 367
    8 A 1206 1146 0.950 54 368
    9 A 905 866 0.957 54 369
    10 A 509 501 0.985 54 370
    11 A 3175 2960 0.932 54 371
C5H8 1,4-Pentadiene 6 A 1538 1433 0.932 55 372
    5 A 1769 1644 0.929 55 373
    4 A 3100 2900 0.935 55 374
    3 A 3220 3012 0.935 55 375
    2 A 3233 3012 0.932 55 376
    1 A 3317 3080 0.929 55 377
CH3CHCHCH3 2-Butene, (Z)- 15 A 384 396 1.031 56 378
    14 A 1013 880 0.868 56 379
    13 A 1090 1037 0.951 56 380
    12 A 1544 1464 0.948 56 381
    11 A 3176 2988 0.941 56 382
    10 A 301 290 0.963 56 383
    9 A 896 880 0.983 56 384
    8 A 1058 986 0.932 56 385
    7 A 1330 1261 0.948 56 386
    6 A 1482 1397 0.943 56 387
    5 A 1562 1448 0.927 56 388
    4 A 1795 1669 0.930 56 389
    3 A 3114 2878 0.924 56 390
    2 A 3225 2965 0.920 56 391
    1 A 3239 3033 0.936 56 392
CH3CHCHCH3 2-Butene, (E)- 12 A 1542 1449 0.940 57 393
    13 A 1106 1057 0.955 57 394
    14 A 1018 964 0.947 57 395
    15 A 247 224 0.907 57 396
    17 A 3175 2954 0.930 57 397
    18 A 1543 1457 0.944 57 398
    19 A 1096 1039 0.948 57 399
    20 A 755 750 0.994 57 400
    22 A 3219 3021 0.939 57 401
    23 A 3197 2960 0.926 57 402
    24 A 3106 2899 0.933 57 403
    25 A 1562 1449 0.928 57 404
CH3SSCH3 Disulfide, dimethyl 1 A 3243 2990 0.922 58 405
    2 A 3229 2983 0.924 58 406
    3 A 3133 2913 0.930 58 407
    4 A 1540 1426 0.926 58 408
    5 A 1525 1419 0.931 58 409
    6 A 1436 1311 0.913 58 410
    7 A 1029 955 0.928 58 411
SF6 Sulfur Hexafluoride 1 A1g 774 774 1.000 59 412
    2 Eg 686 642 0.935 59 413
    3 T1u 1023 948 0.926 59 414
    4 T1u 588 616 1.046 59 415
    5 T2g 500 525 1.051 59 416
    6 T2u 336 347 1.034 59 417
C3H4 cyclopropene 1 A1 3393 3158 0.931 60 418
    2 A1 3145 2909 0.925 60 419
C4H4N2 Pyrazine 19 B3g 3255 3040 0.934 61 420
    18 B2u 1124 1063 0.946 61 421
    17 B2u 1180 1149 0.973 61 422
    16 B2u 1484 1411 0.951 61 423
    15 B2u 3272 3069 0.938 61 424
    14 B2g 752 756 1.005 61 425
    13 B2g 974 983 1.009 61 426
    12 B1u 1057 1018 0.963 61 427
    11 B1u 1192 1130 0.948 61 428
    10 B1u 1566 1483 0.947 61 429
    9 B1u 3256 3012 0.925 61 430
    8 B1g 960 927 0.966 61 431
    7 Au 364 350 0.960 61 432
    6 Au 992 960 0.968 61 433
    5 Ag 614 602 0.980 61 434
    4 Ag 1064 1016 0.955 61 435
    3 Ag 1290 1233 0.956 61 436
    2 Ag 1693 1580 0.933 61 437
    1 Ag 3277 3055 0.932 61 438
C3H4 cyclopropene 3 A1 1766 1653 0.936 62 439
    4 A1 1590 1483 0.933 62 440
    5 A1 1221 1110 0.909 62 441
    6 A1 968 905 0.935 62 442
    7 A2 1053 996 0.946 62 443
    8 A2 841 820 0.975 62 444
CH Methylidyne 1 Σ 3250 3145 0.968 63 445
SiH2Cl2 dichlorosilane 1 A1 2358 2224 0.943 64 446
    2 A1 1000 954 0.954 64 447
    3 A1 544 527 0.969 64 448
    4 A1 192 188 0.978 64 449
    5 A2 744 710 0.954 64 450
    6 B1 2375 2237 0.942 64 451
    7 B1 621 602 0.969 64 452
H2O Water 1 A1 3911 3657 0.935 65 453
NH2 Amino radical 1 A1 3436 3219 0.937 66 454
    2 A1 1601 1497 0.935 66 455
    3 B2 3541 3301 0.932 66 456
NH Imidogen 1 Σ 3334 3283 0.985 67 457
    1 Σ 3385 3314 0.979 67 458
SiH Silylidyne 1 Σ 2090 2043 0.977 68 459
SiH2 silicon dihydride 1 A1 2126 1996 0.939 69 460
    2 A1 1060 999 0.943 69 461
    3 B2 2129 1993 0.936 69 462
SH Mercapto radical 1 Σ 2757 2696 0.978 70 463
PH phosphorus monohydride 1 Σ 2407 2364 0.982 71 464
    1 Σ 2431 2415 0.993 71 465
AlH aluminum monohydride 1 Σ 1727 1682 0.974 72 466
MgH magnesium monohydride 1 Σ 1500 1493 0.996 73 467
BH2 boron dihydride 2 B2 2838 954 0.336 74 468
AlH2 aluminum dihydride 1 A1 1892 1770 0.935 75 469
    2 A1 789 760 0.963 75 470
    3 B2 1929 1807 0.936 75 471

How do we calculate the scaling factor?

Histogram of vibrational frequency ratios

Ratios greater than 1.35 are in the 1.35 bin. Ratios less than 0.7 are in the 0.7 bin.

350
300
250
200
150
100
50
0
0.70 0.75 0.80 0.85 0.90 0.95 1.00 1.05 1.10 1.15 1.20 1.25 1.30 1.35
Ratio of experimental frequency to calculated frequency