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Compare vibrational frequencies in CCCBDB for HCCN (cyanomethylene)

PBEPBEultrafine/6-31+G**

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 A' 3337 3299           
2 A' 1811 1790           
3 A' 1222 1208           
4 A' 448 443           
5 A' 369 365           
6 A" 429 424           
The calculated vibrational frequencies were scaled by 0.9886

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.