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Compare vibrational frequencies in CCCBDB for HClO4 (perchloric acid)

PBEPBE/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' 3604 3555   -2 A'   3557  
2 A' 1240 1223   -84 A'   1307  
3 A' 1122 1107   -73 A'   1180  
4 A' 947 934   -104 A'   1038  
5 A' 645 636   -75 A'   711  
6 A' 490 483   -86 A'   569  
7 A' 463 457   -91 A'   548  
8 A' 338 333   -72 A'   405  
9 A" 1159 1143   -99 A"   1242  
10 A" 494 487   -89 A"   576  
11 A" 341 336   -72 A"   408  
12 A" 134 132   -59 A"   191  
The calculated vibrational frequencies were scaled by 0.9863

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.