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

Compare vibrational frequencies in CCCBDB for H2CCCCH2 (Butatriene)

MP2/LANL2DZ

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3011 16 Ag 2995  
2 Ag 2055 -24 Ag 2079  
3 Ag 1451 21 Ag 1430  
4 Ag 820 -58 Ag 878  
5 Au 747 11 Au 736  
6 B1u 3013 19 B1u 2994  
7 B1u 1550 -58 B1u 1608  
8 B1u 1393 23 B1u 1370  
9 B2g 815 -63 B2g 878 assumed under nu4
10 B2g 496 -48 B2g 544 moved from nu9 moved from nu9
11 B2u 3111 31 B2u 3080  
12 B2u 1031 -29 B2u 1060  
13 B2u 202 -13 B2u 215  
14 B3g 3112 53 B3g 3059  
15 B3g 999   B3g   663 questionable
16 B3g 273 -57 B3g 330  
17 B3u 814 -40 B3u 854  
18 B3u 206 -9 B3u 215 asssumed from nu13
The calculated vibrational frequencies were scaled by 0.9631

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.