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Compare vibrational frequencies in CCCBDB for Cl3- (trichloride anion)

CCD/6-31G*

18 11 26 13 55
Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency Scaled
Frequency
Harm.
diff
Fund.
diff
Symmetry Harmonic
Frequency
Fundamental
Frequency
Comment
1 Σg 251 238   13 Σg   225  
2 Σu 227 214   -113 Σu   327 mode was 3 in reference
3 Πu 157 148           
The calculated vibrational frequencies were scaled by 0.9465

See section Calculated; Vibrations; Scale Factors; Set scaling factors to change the scale factors used here.
See section Calculated; Vibrations; Scale Factors; Calculate a scale factor to determine the least squares best scaling factor.
See section Calculated; Vibrations; Scale Factors; Scale factor uncertainty for information on where the above scaling factor is from.