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Compare vibrational frequencies in CCCBDB for C2H (Ethynyl radical)

ROHF/cc-pVDZ

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 Σ 3637 3130   -168 Σ   3299  
2 Σ 2291 1972   131 Σ   1841  
3 Π 720 619   248 Π   372  
The calculated vibrational frequencies were scaled by 0.8607

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.