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

Compare vibrational frequencies in CCCBDB for C2Cl4 (Tetrachloroethylene)

MP2/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 1596 25 Ag 1571  
2 Ag 369 -78 Ag 447  
3 Ag 208 -29 Ag 237  
4 Au 95 -15 Au 110  
5 B1u 661 -116 B1u 777  
6 B1u 267 -43 B1u 310  
7 B2g 526 14 B2g 512  
8 B2u 778 -130 B2u 908  
9 B2u 162 -14 B2u 176  
10 B3g 878 -122 B3g 1000  
11 B3g 318 -29 B3g 347  
12 B3u 266 -22 B3u 288  
The calculated vibrational frequencies were scaled by 0.9545

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.