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

Compare vibrational frequencies in CCCBDB for CH3NO3 (Methyl nitrate)

MP2/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3065 57 A' 3008  
2 A' 2970 29 A' 2941  
3 A' 1635 -43 A' 1678  
4 A' 1531 63 A' 1468  
5 A' 1445 15 A' 1430  
6 A' 1121 -166 A' 1287  
7 A' 1046 -130 A' 1176  
8 A' 941 -76 A' 1017  
9 A' 769 -85 A' 854  
10 A' 598 -59 A' 657  
11 A' 501 -77 A' 578  
12 A' 320 -20 A' 340  
13 A" 3050 42 A" 3008  
14 A" 1510 55 A" 1455  
15 A" 1127 -9 A" 1136  
16 A" 624 -134 A" 758  
17 A" 216   A"    
18 A" 125   A"    
The calculated vibrational frequencies were scaled by 0.9545

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.