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

Compare vibrational frequencies in CCCBDB for C4H4N2 (Pyridazine)

B3LYP/STO-3G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3102 39 A1 3063  
2 A1 3066 23 A1 3043  
3 A1 1485 -87 A1 1572  
4 A1 1335 -79 A1 1414  
5 A1 1090 -193 A1 1283  
6 A1 1020 -140 A1 1160  
7 A1 945 -118 A1 1063  
8 A1 853 -111 A1 964  
9 A1 597 -22 A1 619  
10 A2 937 1 A2 936  
11 A2 851 -12 A2 863  
12 A2 675 -76 A2 751  
13 A2 319 -102 A2 421  
14 B1 888   B1   760 reassinged to mode 15
15 B1 688 -72 B1 760 696 questionable
16 B1 319 -51 B1 370  
17 B2 3088 13 B2 3075  
18 B2 3062 19 B2 3043  
19 B2 1476 -89 B2 1565  
20 B2 1319 -125 B2 1444  
21 B2 1161 -78 B2 1239  
22 B2 992 -60 B2 1052  
23 B2 942 -67 B2 1009  
24 B2 565 -99 B2 664  
The calculated vibrational frequencies were scaled by 0.8924

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.