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

Compare vibrational frequencies in CCCBDB for H2CCCCH2 (Butatriene)

MP2=FULL/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 2993 -2 Ag 2995  
2 Ag 2068 -11 Ag 2079  
3 Ag 1473 43 Ag 1430  
4 Ag 837 -41 Ag 878  
5 Au 765 29 Au 736  
6 B1u 2994 0 B1u 2994  
7 B1u 1565 -43 B1u 1608  
8 B1u 1412 42 B1u 1370  
9 B2g 875 -3 B2g 878 assumed under nu4
10 B2g 209 -335 B2g 544 moved from nu9 moved from nu9
11 B2u 3066 -14 B2u 3080  
12 B2u 1063 3 B2u 1060  
13 B2u 195 -20 B2u 215  
14 B3g 3065 6 B3g 3059  
15 B3g 1041   B3g   663 questionable
16 B3g 226 -104 B3g 330  
17 B3u 881 27 B3u 854  
18 B3u 176 -39 B3u 215 asssumed from nu13
The calculated vibrational frequencies were scaled by 0.948

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.