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Compare vibrational frequencies in CCCBDB for C3 (carbon trimer)

PBEPBE/6-311G*

17 05 22 16 49
Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 1173 -52 Σg 1225  
2 Σu 2051 11 Σu 2040  
3 Πu 72i -136 Πu 63  
The calculated vibrational frequencies were scaled by 0.9896

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.