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

Compare vibrational frequencies in CCCBDB for GeH2 (germylene)

QCISD/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 887 -969 A1 1856  
2 A1 1716 800 A1 916  
3 B2 1734 -128 B2 1863  
The calculated vibrational frequencies were scaled by 0.9523

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.