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Compare vibrational frequencies in CCCBDB for N2H2 ((E)-diazene)

BLYP/3-21G

18 11 26 13 55
Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency Scaled
Frequency
Harm.
diff
Fund.
diff
Symmetry Harmonic
Frequency
Fundamental
Frequency
Comment
1 Ag 2856 2841   -217 Ag   3058  
2 Ag 1601 1592   9 Ag   1583  
3 Ag 1271 1264   -265 Ag   1529  
4 Au 1276 1269   -20 Au   1289  
5 Bu 2884 2868   -252 Bu   3120  
6 Bu 1319 1312   -4 Bu   1316  
The calculated vibrational frequencies were scaled by 0.9945

See section Calculated; Vibrations; Scale Factors; Set scaling factors to change the scale factors used here.
See section Calculated; Vibrations; Scale Factors; Calculate a scale factor to determine the least squares best scaling factor.
See section Calculated; Vibrations; Scale Factors; Scale factor uncertainty for information on where the above scaling factor is from.