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

Compare vibrational frequencies in CCCBDB for F3- (trifluoride anion)

mPW1PW91/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 596 135 Σg 461  
2 Σu 812 262 Σu 550 mode was 3 in reference
3 Πu 348        
The calculated vibrational frequencies were scaled by 0.8789

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.