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

Compare vibrational frequencies in CCCBDB for CH3CCCH3 (2-Butyne)

MP2/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1' 2924 8 A1' 2916  
2 A1' 2182 -58 A1' 2240  
3 A1' 1390 10 A1' 1380  
4 A1' 693 -32 A1' 725  
5 A1" 17        
6 A2" 2925 -13 A2" 2938  
7 A2" 1385 3 A2" 1382  
8 A2" 1137 -15 A2" 1152  
9 E' 3004 31 E' 2973  
10 E' 1459 3 E' 1456  
11 E' 1032 -22 E' 1054  
12 E' 183 -30 E' 213  
13 E" 3005 39 E" 2966  
14 E" 1459 11 E" 1448  
15 E" 995 -34 E" 1029  
16 E" 158 -213 E" 371  
The calculated vibrational frequencies were scaled by 0.943

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.