return to home page

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

Compare vibrational frequencies in CCCBDB for C4H6 (Methylenecyclopropane)

LSDA/6-31G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 3029 19 A1 3010  
2 A1 3005 3 A1 3002  
3 A1 1820 77 A1 1743  
4 A1 1418 -19 A1 1437  
5 A1 1375 -35 A1 1410  
6 A1 1073 37 A1 1036  
7 A1 982 -20 A1 1002  
8 A1 752 29 A1 723  
9 A2 3074 23 A2 3051  
10 A2 1113 -31 A2 1144  
11 A2 912 -25 A2 937  
12 A2 583 -33 A2 616  
13 B1 3086 15 B1 3071  
14 B1 1043 -29 B1 1072  
15 B1 850 -39 B1 889  
16 B1 721 -27 B1 748  
17 B1 279 -81 B1 360  
18 B2 3111 25 B2 3086  
19 B2 3005 6 B2 2999  
20 B2 1378 25 B2 1353  
21 B2 1103 -71 B2 1174  
22 B2 1014 -111 B2 1125  
23 B2 882 90 B2 792  
24 B2 334 44 B2 290  
The calculated vibrational frequencies were scaled by 0.9813

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.