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

Compare vibrational frequencies in CCCBDB for C2H (Ethynyl radical)

MP2=FULL/cc-pVDZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σ 3396 97 Σ 3299  
2 Σ 2326 485 Σ 1841  
3 Π 771 400 Π 372  
The calculated vibrational frequencies were scaled by 0.9504

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.