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

Compare vibrational frequencies in CCCBDB for H2OH2O (water dimer)

CID/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3417 -318 A' 3735  
2 A' 3339 -321 A' 3660  
3 A' 3280 -321 A' 3601  
4 A' 1685 69 A' 1616  
5 A' 1626 27 A' 1599  
6 A' 477 166 A' 311  
7 A' 249 106 A' 143  
8 A' 200 97 A' 103  
9 A" 3459 -286 A" 3745  
10 A" 770 247 A" 523  
11 A" 204 96 A" 108  
12 A" 133 45 A" 88  
The calculated vibrational frequencies were scaled by 0.9305

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.