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

Compare vibrational frequencies in CCCBDB for P2H4 (H2PPH2)

MP2/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A 2533 237 A 2296  
2 A 2495 214 A 2281  
3 A 1261 212 A 1049  
4 A 947 166 A 781  
5 A 767 114 A 653  
6 A 511 74 A 437  
7 A 139 -30 A 169  
8 B 2536 240 B 2296  
9 B 2493 212 B 2281  
10 B 1251 198 B 1053  
11 B 898 20 B 878  
12 B 723 87 B 636  
The calculated vibrational frequencies were scaled by 0.8719

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.