return to home page Computational Chemistry Comparison and Benchmark DataBase Release 19 (April 2018) Standard Reference Database 101 National Institute of Standards and Technology
You are here: Comparisons > Vibrations > Vibrations

Compare vibrational frequencies in CCCBDB for C4 (Carbon tetramer)

MP2/CEP-31G*

17 05 22 16 49
Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Σg 2019 -38 Σg+ 2057  
2 Σg 871        
3 Σu 1484 -65 Σu 1549  
4 Πg 555 232 Πg 323  
5 Πu 215 55 Πu 160  
The calculated vibrational frequencies were scaled by 0.9494

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.