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

Compare vibrational frequencies in CCCBDB for C2H3NO3 (Oxamic acid)

CID/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3521 181 A' 3340  
2 A' 3403 174 A' 3229  
3 A' 3356 756 A' 2600 hydrogen bonded
4 A' 1785 44 A' 1741  
5 A' 1713 26 A' 1687  
6 A' 1620 25 A' 1595  
7 A' 1367 -103 A' 1470  
8 A' 1282 -78 A' 1360  
9 A' 1160 -81 A' 1241  
10 A' 1092 8 A' 1084  
11 A' 743 -88 A' 831  
12 A' 612 -75 A' 687  
13 A' 539 -17 A' 556  
14 A' 403 -52 A' 455  
15 A' 268 -60 A' 328  
16 A" 807 -177 A" 984  
17 A" 684 -131 A" 815  
18 A" 652 -93 A" 745  
19 A" 624 143 A" 481  
20 A" 437 122 A" 315  
21 A" 143 -19 A" 162  
The calculated vibrational frequencies were scaled by 0.9305

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.