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

Compare vibrational frequencies in CCCBDB for C4H9N (Cyclobutylamine)

PBEPBE/3-21G*

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A' 3121 -224 A' 3345  
2 A' 2971 -4 A' 2975  
3 A' 2934 -16 A' 2950  
4 A' 2898 -20 A' 2918  
5 A' 2876 -29 A' 2905  
6 A' 2750 -137 A' 2887  
7 A' 1584 -30 A' 1614  
8 A' 1420 -47 A' 1467  
9 A' 1394 -49 A' 1443  
10 A' 1274 -116 A' 1390  
11 A' 1187 -104 A' 1291  
12 A' 1153 -84 A' 1237  
13 A' 1057 -80 A' 1137  
14 A' 1001 -119 A' 1120  
15 A' 885 -165 A' 1050  
16 A' 834 -131 A' 965  
17 A' 800 12 A' 788  
18 A' 669 -83 A' 752  
19 A' 600 -6 A' 606  
20 A' 369 -79 A' 448  
21 A' 174 0 A' 174  
22 A" 3218 -193 A" 3411  
23 A" 2936 -34 A" 2970  
24 A" 2870 -87 A" 2957  
25 A" 1393 -59 A" 1452  
26 A" 1249 36 A" 1213  
27 A" 1207 22 A" 1185  
28 A" 1180 12 A" 1168  
29 A" 1137 101 A" 1036  
30 A" 1072   A"   947 questionable
31 A" 990 65 A" 925  
32 A" 856 -56 A" 912  
33 A" 842 -41 A" 883  
34 A" 719 -69 A" 788  
35 A" 364 10 A" 354  
36 A" 266 26 A" 240  
The calculated vibrational frequencies were scaled by 0.9535

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.