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

Compare vibrational frequencies in CCCBDB for C2H2N4 (sym-tetrazine)

PBEPBE/6-311G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 Ag 3092 82 Ag 3010  
2 Ag 1387 -28 Ag 1415  
3 Ag 997 -12 Ag 1009  
4 Ag 726 -10 Ag 736  
5 Au 274 -61 Au 335  
6 B1u 3091 5 B1u 3086  
7 B1u 1173 -31 B1u 1204  
8 B1u 1053 -40 B1u 1093  
9 B2g 948 -46 B2g 994  
10 B2g 797 -4 B2g 801  
11 B2u 1405 -43 B2u 1448  
12 B2u 1105 1 B2u 1104  
13 B2u 945 62 B2u 883  
14 B3g 1478 -47 B3g 1525  
15 B3g 1266 -24 B3g 1290  
16 B3g 619 -21 B3g 640  
17 B3u 882 -47 B3u 929  
18 B3u 113 -141 B3u 254  
The calculated vibrational frequencies were scaled by 0.9909

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.