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

Compare vibrational frequencies in CCCBDB for Si2H6 (disilane)

BLYP/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1g 2368 216 A1g 2152  
2 A1g 987 78 A1g 909  
3 A1g 492 58 A1g 434  
4 A1u 78 -53 A1u 131  
5 A2u 2369 215 A2u 2154  
6 A2u 911 67 A2u 844  
7 Eg 2415 260 Eg 2155 Eg and Eu modes switched
8 Eg 1016 87 Eg 929  
9 Eg 661 36 Eg 625  
10 Eu 2422 243 Eu 2179 Eg and Eu modes switched
11 Eu 1022 83 Eu 940  
12 Eu 447 68 Eu 379  
The calculated vibrational frequencies were scaled by 0.9252

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.