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Compare vibrational frequencies in CCCBDB for HClO4 (perchloric acid)

MP2/6-31G

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 A' 3439 3291   -266 A'   3557  
2 A' 1016 972   -335 A'   1307  
3 A' 794 760   -420 A'   1180  
4 A' 723 692   -346 A'   1038  
5 A' 463 443   -268 A'   711  
6 A' 356 340   -229 A'   569  
7 A' 306 293   -255 A'   548  
8 A' 220 211   -194 A'   405  
9 A" 785 751   -491 A"   1242  
10 A" 363 347   -229 A"   576  
11 A" 235 225   -183 A"   408  
12 A" 62i 59i   -250 A"   191  
The calculated vibrational frequencies were scaled by 0.9568

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.