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

Compare vibrational frequencies in CCCBDB for C5H8 (Cyclopentene)

BLYP/3-21G

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3123 57 A' 3066  
2 A' 3035 77 A' 2958  
3 A' 2994 78 A' 2916  
4 A' 2973 71 A' 2902  
5 A' 2937 85 A' 2852  
6 A' 1615 -1 A' 1616  
7 A' 1515 48 A' 1467  
8 A' 1494 45 A' 1449  
9 A' 1284 -18 A' 1302  
10 A' 1226 -58 A' 1284  
11 A' 1127 -86 A' 1213  
12 A' 1046 -2 A' 1048  
13 A' 926 -38 A' 964  
14 A' 854 -108 A' 962  
15 A' 792 -112 A' 904  
16 A' 696 4 A' 692  
17 A' 614 11 A' 603  
18 A' 112 -142 A' 254  
19 A" 3095 56 A" 3039  
20 A" 2979 12 A" 2967  
21 A" 2937 10 A" 2927  
22 A" 1499 32 A" 1467  
23 A" 1348 -84 A" 1432  
24 A" 1309 -47 A" 1356  
25 A" 1290 -12 A" 1302  
26 A" 1200 -97 A" 1297  
27 A" 1158 -49 A" 1207  
28 A" 989 -124 A" 1113  
29 A" 940 -142 A" 1082  
30 A" 889 -48 A" 937  
31 A" 854 54 A" 800  
32 A" 767 65 A" 702  
33 A" 372 -15 A" 387  
The calculated vibrational frequencies were scaled by 0.9945

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.