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IV.C.1. (XIII.D.1.)

Compare vibrational frequencies in CCCBDB for CH3COOCH3 (methyl acetate)

MP2/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3073 38 A' 3035  
2 A' 3068 37 A' 3031  
3 A' 2972 6 A' 2966  
4 A' 2963 -1 A' 2964  
5 A' 1648 -123 A' 1771  
6 A' 1530 70 A' 1460  
7 A' 1501 61 A' 1440  
8 A' 1453 23 A' 1430  
9 A' 1407 32 A' 1375  
10 A' 1200 -48 A' 1248  
11 A' 1149 -10 A' 1159  
12 A' 1028 -32 A' 1060  
13 A' 930 -50 A' 980  
14 A' 769 -75 A' 844  
15 A' 604 -35 A' 639  
16 A' 389 -40 A' 429  
17 A' 257 -46 A' 303  
18 A" 3041 36 A" 3005  
19 A" 3031 37 A" 2994  
20 A" 1516 56 A" 1460  
21 A" 1510 80 A" 1430  
22 A" 1135 -52 A" 1187  
23 A" 1074 38 A" 1036  
24 A" 569 -38 A" 607  
25 A" 166 -21 A" 187  
26 A" 98 -38 A" 136  
27 A" 87 -23 A" 110  
The calculated vibrational frequencies were scaled by 0.9545

See section XIII.C.3 List or set vibrational scaling factors to change the scale factors used here.
See section III.B.3.c Calculate a vibrational scaling factor for a set of molecules to determine the least squares best scaling factor.
See section III.B.3.b List of vibrational scaling factors and their uncertainties for information on where the above scaling factor is from.