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

Compare vibrational frequencies in CCCBDB for CH2D2 (methane-d2)

LSDA/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3005 31 A1 2974  
2 A1 2165 -37 A1 2202  
3 A1 1449 13 A1 1436  
4 A1 1035 2 A1 1033  
5 A2 1342 9 A2 1333  
6 B1 2264 -749 B1 3013  
7 B1 1243 153 B1 1090  
8 B2 3061 827 B2 2234  
9 B2 1095 -139 B2 1234  
The calculated vibrational frequencies were scaled by 0.982

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.