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

Compare vibrational frequencies in CCCBDB for C2H2O2 (Ethanedial)

mPW1PW91/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 2861 18 Ag 2843  
2 Ag 1669 -76 Ag 1745  
3 Ag 1327 -11 Ag 1338  
4 Ag 983 -82 Ag 1065  
5 Ag 528 -23 Ag 551  
6 Au 831 30 Au 801  
7 Au 194 67 Au 127  
8 Bg 1069 21 Bg 1048  
9 Bu 2861 26 Bu 2835  
10 Bu 1661 -71 Bu 1732  
11 Bu 1289 -23 Bu 1312  
12 Bu 300 -39 Bu 339  
The calculated vibrational frequencies were scaled by 0.9496

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.