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

Compare vibrational frequencies in CCCBDB for C2H4+ (Ethylene cation)

B2PLYP/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3043        
2 Ag 1513 25 Ag 1488  
3 Ag 1229 -29 Ag 1259  
4 Au 324i -408 Au 84  
5 B1u 3039        
6 B1u 1430        
7 B2g 1078 177 B3u 901  
8 B2u 3159 2056 B2g 1103  
9 B2u 819        
10 B3g 3146 2333 B2u 813  
11 B3g 1198 -1781 B1u 2979  
12 B3u 952 -460 B1u 1412  
The calculated vibrational frequencies were scaled by 0.9492

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.