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

Compare vibrational frequencies in CCCBDB for H2OH2O (water dimer)

CISD/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3416 -319 A' 3735  
2 A' 3335 -325 A' 3660  
3 A' 3278 -323 A' 3601  
4 A' 1689 73 A' 1616  
5 A' 1629 30 A' 1599  
6 A' 482 171 A' 311  
7 A' 252 109 A' 143  
8 A' 202 99 A' 103  
9 A" 3456 -289 A" 3745  
10 A" 775 252 A" 523  
11 A" 206 98 A" 108  
12 A" 132 44 A" 88  
The calculated vibrational frequencies were scaled by 0.9344

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.