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

Compare vibrational frequencies in CCCBDB for C6H4O2 (parabenzoquinone)

MP2=FULL/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3071 9 Ag 3062  
2 Ag 1626 -60 Ag 1686  
3 Ag 1566 -101 Ag 1667  
4 Ag 1123 -24 Ag 1147  
5 Ag 749 -21 Ag 770  
6 Ag 428 -15 Ag 443  
7 Au 909   Au    
8 Au 301   Au    
9 B1g 708 -37 B1g 745 B2G in ref
10 B1u 3055 -7 B1u 3062 B2G in ref
11 B1u 1620 -48 B1u 1668 B2G in ref
12 B1u 1326 -28 B1u 1354 B2G in ref
13 B1u 907 -37 B1u 944 B2G in ref
14 B1u 722 -6 B1u 728 B2G in ref
15 B2g 909 -89 B2g 998 B3G in ref
16 B2g 657 -137 B2g 794 B3G in ref
17 B2g 179 -62 B2g 241 B3G in ref
18 B2u 3070 8 B2u 3062 B3U in ref
19 B2u 1561 -31 B2u 1592 B3U in ref
20 B2u 1287 -12 B2u 1299 B3U in ref
21 B2u 1046 -20 B2u 1066 B3U in ref
22 B2u 387 -21 B2u 408 B3U in ref
23 B3g 3055 11 B3g 3044 B1G in ref
24 B3g 1357 -17 B3g 1374 B1G in ref
25 B3g 1200 -11 B3g 1211 B1G in ref
26 B3g 574 -26 B3g 600 B1G in ref
27 B3g 425 -51 B3g 476 B1G in ref
28 B3u 835 -47 B3u 882 B1U in ref
29 B3u 477 -28 B3u 505 B1U in ref
30 B3u 86 -23 B3u 109 B1U in ref
The calculated vibrational frequencies were scaled by 0.9422

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.