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

Compare vibrational frequencies in CCCBDB for C6H4O2 (parabenzoquinone)

MP2=FULL/6-31+G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3085 23 Ag 3062  
2 Ag 1600 -86 Ag 1686  
3 Ag 1540 -127 Ag 1667  
4 Ag 1113 -34 Ag 1147  
5 Ag 745 -25 Ag 770  
6 Ag 425 -18 Ag 443  
7 Au 897   Au    
8 Au 281   Au    
9 B1g 692 -53 B1g 745 B2G in ref
10 B1u 3068 6 B1u 3062 B2G in ref
11 B1u 1585 -83 B1u 1668 B2G in ref
12 B1u 1319 -35 B1u 1354 B2G in ref
13 B1u 900 -44 B1u 944 B2G in ref
14 B1u 718 -10 B1u 728 B2G in ref
15 B2g 895 -103 B2g 998 B3G in ref
16 B2g 532 -262 B2g 794 B3G in ref
17 B2g 33i -274 B2g 241 B3G in ref
18 B2u 3084 22 B2u 3062 B3U in ref
19 B2u 1545 -47 B2u 1592 B3U in ref
20 B2u 1276 -23 B2u 1299 B3U in ref
21 B2u 1038 -28 B2u 1066 B3U in ref
22 B2u 384 -24 B2u 408 B3U in ref
23 B3g 3068 24 B3g 3044 B1G in ref
24 B3g 1350 -24 B3g 1374 B1G in ref
25 B3g 1193 -18 B3g 1211 B1G in ref
26 B3g 570 -30 B3g 600 B1G in ref
27 B3g 424 -52 B3g 476 B1G in ref
28 B3u 808 -74 B3u 882 B1U in ref
29 B3u 465 -40 B3u 505 B1U in ref
30 B3u 76 -33 B3u 109 B1U in ref
The calculated vibrational frequencies were scaled by 0.9392

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.