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

Compare vibrational frequencies in CCCBDB for HCNO (fulminic acid)

LSDA/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σ 3419 83 Σ 3336  
2 Σ 2232 37 Σ 2196  
3 Σ 1173 -81 Σ 1254  
4 Π 573 36 Π 537  
5 Π 520 296 Π 224  
The calculated vibrational frequencies were scaled by 0.9836

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.