III.G.7. (XIII.B.3.) (XIII.D.5.) |
Compare vibrational frequencies for two calculations for N2O5 (Dinitrogen pentoxide)
A =
HF/6-31G*
B =
MP2/6-31G*
scale factors=0.8985, 0.943
symmetry | frequency (cm-1) | reduced mass (amu) | IR Intensity (km mol-1) | ||||||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
mode number | A | B | A | B | diff. | ratio | A | B | diff. | ratio | A | B | diff. | ratio | |||
1 | A' | A' | 1773 | 1782 | -8.3 | 0.995 | 14.556 | 14.601 | -0.044 | 0.997 | 739.54 | 149.27 | 590.27 | 4.954 | |||
2 | A' | A' | 1457 | 1304 | 153.4 | 1.118 | 15.091 | 15.238 | -0.147 | 0.990 | 80.76 | 55.05 | 25.70 | 1.467 | |||
3 | A' | A' | 1349 | 1208 | 141.5 | 1.117 | 15.450 | 15.497 | -0.047 | 0.997 | 392.85 | 322.44 | 70.41 | 1.218 | |||
4 | A' | A' | 965 | 818 | 147.1 | 1.180 | 15.199 | 15.164 | 0.035 | 1.002 | 61.52 | 101.45 | -39.93 | 0.606 | |||
5 | A' | A' | 893 | 727 | 165.6 | 1.228 | 15.285 | 14.982 | 0.303 | 1.020 | 576.73 | 31.75 | 544.97 | 18.162 | |||
6 | A' | A' | 874 | 680 | 194.0 | 1.285 | 14.904 | 15.288 | -0.384 | 0.975 | 32.20 | 222.46 | -190.25 | 0.145 | |||
7 | A' | A' | 760 | 579 | 181.7 | 1.314 | 15.552 | 15.341 | 0.211 | 1.014 | 65.05 | 84.20 | -19.15 | 0.773 | |||
8 | A' | A' | 633 | 503 | 130.4 | 1.259 | 15.326 | 15.490 | -0.164 | 0.989 | 14.80 | 228.43 | -213.63 | 0.065 | |||
9 | A' | A' | 449 | 233 | 215.6 | 1.924 | 15.635 | 15.401 | 0.234 | 1.015 | 4.84 | 202.55 | -197.71 | 0.024 | |||
10 | A' | A' | 225 | 179 | 46.8 | 1.262 | 15.803 | 15.792 | 0.011 | 1.001 | 3.31 | 3.79 | -0.47 | 0.875 | |||
11 | A" | A" | 1794 | 1919 | -125.0 | 0.935 | 14.576 | 14.605 | -0.029 | 0.998 | 777.99 | 165.71 | 612.28 | 4.695 | |||
12 | A" | A" | 782 | 690 | 92.5 | 1.134 | 14.441 | 14.418 | 0.023 | 1.002 | 25.08 | 10.35 | 14.73 | 2.422 | |||
13 | A" | A" | 590 | 436 | 154.0 | 1.353 | 15.733 | 15.731 | 0.003 | 1.000 | 0.00 | 5.14 | -5.14 | 0.000 | |||
14 | A" | A" | 90 | 82 | 8.4 | 1.103 | 15.981 | 15.984 | -0.003 | 1.000 | 0.25 | 0.00 | 0.25 | 180.500 | |||
15 | A" | A" | 24 | 37 | -12.9 | 0.652 | 15.954 | 15.958 | -0.004 | 1.000 | 0.67 | 0.00 | 0.67 | 2228.000 | |||
scaled by | 0.8985 | 0.943 |
See section III.C.1 List or set vibrational scaling factors
to change the scale factors used here.
See section III.C.2
Calculate a vibrational scaling factor for a given set of molecules
to determine the least squares best scaling factor.