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

Compare vibrational frequencies in CCCBDB for C3H4N2 (1H-Imidazole)

MP2/6-31+G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3503 -14 A' 3517  
2 A' 3161 18 A' 3143  
3 A' 3143 20 A' 3123  
4 A' 3137 27 A' 3110  
5 A' 1468 20 A' 1448  
6 A' 1434 30 A' 1404  
7 A' 1398 70 A' 1328  
8 A' 1312 47 A' 1265  
9 A' 1220 32 A' 1188  
10 A' 1121 23 A' 1098  
11 A' 1100 38 A' 1062  
12 A' 1055 42 A' 1013  
13 A' 1032 44 A' 988  
14 A' 883 -40 A' 923  
15 A' 846 -52 A' 898  
16 A" 759 -72 A" 831  
17 A" 716 -42 A" 758  
18 A" 645 -29 A" 674  
19 A" 627 -36 A" 663  
20 A" 579 -42 A" 621  
21 A" 447 -92 A" 539  
The calculated vibrational frequencies were scaled by 0.9406

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.