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

Compare vibrational frequencies in CCCBDB for Si2H6 (disilane)

HF/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1g 2337 185 A1g 2152  
2 A1g 994 85 A1g 909  
3 A1g 491 57 A1g 434  
4 A1u 91 -40 A1u 131  
5 A2u 2336 182 A2u 2154  
6 A2u 915 72 A2u 844  
7 Eg 2374 219 Eg 2155 Eg and Eu modes switched
8 Eg 1016 87 Eg 929  
9 Eg 665 40 Eg 625  
10 Eu 2378 199 Eu 2179 Eg and Eu modes switched
11 Eu 1021 82 Eu 940  
12 Eu 457 78 Eu 379  
The calculated vibrational frequencies were scaled by 0.8165

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.