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

Compare vibrational frequencies in CCCBDB for C2H (Ethynyl radical)

MP2=FULL/aug-cc-pVDZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σ 3447 148 Σ 3299  
2 Σ 2376 535 Σ 1841  
3 Π 734 362 Π 372  
The calculated vibrational frequencies were scaled by 0.9692

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.