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

Compare vibrational frequencies in CCCBDB for HClO4 (perchloric acid)

B3LYP/6-31+G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3567 10 A' 3557  
2 A' 1206 -101 A' 1307  
3 A' 1093 -87 A' 1180  
4 A' 915 -123 A' 1038  
5 A' 636 -75 A' 711  
6 A' 489 -80 A' 569  
7 A' 466 -82 A' 548  
8 A' 343 -62 A' 405  
9 A" 1101 -141 A" 1242  
10 A" 494 -82 A" 576  
11 A" 350 -58 A" 408  
12 A" 157 -34 A" 191  
The calculated vibrational frequencies were scaled by 0.9642

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.