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

Compare vibrational frequencies in CCCBDB for H2OH2O (water dimer)

CCD/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3495 -240 A' 3735  
2 A' 3404 -256 A' 3660  
3 A' 3359 -242 A' 3601  
4 A' 1746 130 A' 1616  
5 A' 1684 85 A' 1599  
6 A' 500 189 A' 311  
7 A' 263 120 A' 143  
8 A' 210 107 A' 103  
9 A" 3533 -212 A" 3745  
10 A" 798 275 A" 523  
11 A" 216 108 A" 108  
12 A" 136 48 A" 88  
The calculated vibrational frequencies were scaled by 0.9723

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.