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

Compare vibrational frequencies in CCCBDB for CH2CHCHCH2 (1,3-Butadiene)

MP2/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3149 62 Ag 3087  
2 Ag 3056 53 Ag 3003  
3 Ag 3013 21 Ag 2992  
4 Ag 1594 -36 Ag 1630  
5 Ag 1413 -25 Ag 1438  
6 Ag 1240 -40 Ag 1280  
7 Ag 1136 -60 Ag 1196  
8 Ag 827 -67 Ag 894  
9 Ag 455 -57 Ag 512  
10 Au 1007 -6 Au 1013  
11 Au 856 -52 Au 908  
12 Au 484 -38 Au 522  
13 Au 130 -32 Au 162  
14 Bg 972 -4 Bg 976  
15 Bg 858 -54 Bg 912  
16 Bg 713 -57 Bg 770  
17 Bu 3149 48 Bu 3101  
18 Bu 3059 4 Bu 3055  
19 Bu 3011 27 Bu 2984  
20 Bu 1535 -61 Bu 1596  
21 Bu 1344 -37 Bu 1381  
22 Bu 1235 -59 Bu 1294  
23 Bu 938 -52 Bu 990  
24 Bu 263 -38 Bu 301  
The calculated vibrational frequencies were scaled by 0.8719

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.