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

MP2/6-31+G**

18 11 26 13 55
Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency Scaled
Frequency
Harm.
diff
Fund.
diff
Symmetry Harmonic
Frequency
Fundamental
Frequency
Comment
1 Ag 3248 3055           
2 Ag 1616 1520   31 Ag   1488  
3 Ag 1309 1232   -27 Ag   1259  
4 Au 110i 103i   -187 Au   84  
5 B1u 3241 3049           
6 B1u 1523 1433           
7 B2g 1148 1080   179 B3u   901  
8 B2u 3382 3181   2078 B2g   1103  
9 B2u 870 819           
10 B3g 3368 3168   2355 B2u   813  
11 B3g 1275 1199   -1780 B1u   2979  
12 B3u 1026 965   -446 B1u   1412  
The calculated vibrational frequencies were scaled by 0.9406

See section Calculated; Vibrations; Scale Factors; Set scaling factors to change the scale factors used here.
See section Calculated; Vibrations; Scale Factors; Calculate a scale factor to determine the least squares best scaling factor.
See section Calculated; Vibrations; Scale Factors; Scale factor uncertainty for information on where the above scaling factor is from.