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

Compare vibrational frequencies in CCCBDB for C5H8 (Cyclopentene)

MP2/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3087 21 A' 3066  
2 A' 3018 60 A' 2958  
3 A' 2982 66 A' 2916  
4 A' 2962 60 A' 2902  
5 A' 2935 83 A' 2852  
6 A' 1570 -46 A' 1616  
7 A' 1517 50 A' 1467  
8 A' 1498 49 A' 1449  
9 A' 1289 -13 A' 1302  
10 A' 1228 -56 A' 1284  
11 A' 1128 -85 A' 1213  
12 A' 1054 6 A' 1048  
13 A' 913 -51 A' 964  
14 A' 846 -116 A' 962  
15 A' 797 -107 A' 904  
16 A' 697 5 A' 692  
17 A' 602 -1 A' 603  
18 A' 126 -128 A' 254  
19 A" 3058 19 A" 3039  
20 A" 2982 15 A" 2967  
21 A" 2936 9 A" 2927  
22 A" 1509 42 A" 1467  
23 A" 1346 -86 A" 1432  
24 A" 1314 -42 A" 1356  
25 A" 1296 -6 A" 1302  
26 A" 1195 -102 A" 1297  
27 A" 1158 -49 A" 1207  
28 A" 985 -128 A" 1113  
29 A" 926 -156 A" 1082  
30 A" 889 -48 A" 937  
31 A" 845 45 A" 800  
32 A" 756 54 A" 702  
33 A" 371 -16 A" 387  
The calculated vibrational frequencies were scaled by 0.9513

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.