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

Compare vibrational frequencies in CCCBDB for H2CCCCH2 (Butatriene)

HF/CEP-31G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3005 10 Ag 2995  
2 Ag 2139 60 Ag 2079  
3 Ag 1442 12 Ag 1430  
4 Ag 854 -24 Ag 878  
5 Au 740 4 Au 736  
6 B1u 3006 12 B1u 2994  
7 B1u 1616 8 B1u 1608  
8 B1u 1380 10 B1u 1370  
9 B2g 937 59 B2g 878 assumed under nu4
10 B2g 476 -68 B2g 544 moved from nu9 moved from nu9
11 B2u 3088 8 B2u 3080  
12 B2u 1022 -38 B2u 1060  
13 B2u 198 -17 B2u 215  
14 B3g 3088 29 B3g 3059  
15 B3g 985   B3g   663 questionable
16 B3g 197 -133 B3g 330  
17 B3u 940 86 B3u 854  
18 B3u 213 -2 B3u 215 asssumed from nu13
The calculated vibrational frequencies were scaled by 0.9014

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.