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

Compare vibrational frequencies in CCCBDB for H2OH2O (water dimer)

PBEPBE/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3372 -363 A' 3735  
2 A 3043 -617 A' 3660  
3 A' 3052 -549 A' 3601  
4 A 1136 -480 A' 1616  
5 A' 1643 44 A' 1599  
6 A 316 5 A' 311  
7 A' 319 176 A' 143  
8 A 3137 3034 A' 103  
9 A" 3435 -310 A" 3745  
10 A 555 32 A" 523  
11 A" 234 126 A" 108  
12 A 282 194 A" 88  
The calculated vibrational frequencies were scaled by 0.9909

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.