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

Compare vibrational frequencies in CCCBDB for Si2H6 (disilane)

B1B95/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1g 2361 209 A1g 2152  
2 A1g 966 57 A1g 909  
3 A1g 496 62 A1g 434  
4 A1u 102 -29 A1u 131  
5 A2u 2362 208 A2u 2154  
6 A2u 893 50 A2u 844  
7 Eg 2406 251 Eg 2155 Eg and Eu modes switched
8 Eg 995 66 Eg 929  
9 Eg 657 32 Eg 625  
10 Eu 2411 233 Eu 2179 Eg and Eu modes switched
11 Eu 1000 61 Eu 940  
12 Eu 450 71 Eu 379  
The calculated vibrational frequencies were scaled by 0.883

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.