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

Compare vibrational frequencies in CCCBDB for H2Se (Hydrogen selenide)

PM3

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1   -2345 A1 2345  
2   -1034 A1 1034  
3   -2358 B2 2358  
The calculated vibrational frequencies were scaled by 0.974

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.