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

Compare vibrational frequencies in CCCBDB for CH3COCH2CH3 (2-Butanone)

HF/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 2984 1 A' 2983  
2 A' 2957 -26 A' 2983  
3 A' 2903 -7 A' 2910  
4 A' 2893 -17 A' 2910  
5 A' 2885 1 A' 2884  
6 A' 1747 31 A' 1716  
7 A' 1506 46 A' 1460  
8 A' 1471 49 A' 1422  
9 A' 1462 49 A' 1413  
10 A' 1431 58 A' 1373  
11 A' 1406 60 A' 1346  
12 A' 1354 91 A' 1263  
13 A' 1158 -24 A' 1182  
14 A' 1095 6 A' 1089  
15 A' 969 -28 A' 997  
16 A' 912 -27 A' 939  
17 A' 725 -35 A' 760  
18 A' 565 -25 A' 590  
19 A' 391 -22 A' 413  
20 A' 249 -11 A' 260  
21 A" 2967 -16 A" 2983  
22 A" 2938 -45 A" 2983  
23 A" 2911 -30 A" 2941  
24 A" 1508 48 A" 1460  
25 A" 1490 77 A" 1413  
26 A" 1291 28 A" 1263  
27 A" 1141 33 A" 1108  
28 A" 980 28 A" 952  
29 A" 764 -4 A" 768  
30 A" 481 21 A" 460  
31 A" 195 -6 A" 201  
32 A" 111 5 A" 106  
33 A" 51 -36 A" 87  
The calculated vibrational frequencies were scaled by 0.9026

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.