return to home page

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

Compare vibrational frequencies in CCCBDB for CH2C(CH3)CH3 (1-Propene, 2-methyl-)

HF/6-311G**

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2978 -11 A1 2989  
2 A1 2947 6 A1 2941  
3 A1 2867 -44 A1 2911  
4 A1 1690 29 A1 1661  
5 A1 1471 1 A1 1470  
6 A1 1420 4 A1 1416  
7 A1 1389 23 A1 1366  
8 A1 1065 1 A1 1064  
9 A1 779 -22 A1 801  
10 A1 366 -17 A1 383  
11 A2 2901 -69 A2 2970  
12 A2 1444 -15 A2 1459  
13 A2 1004 -72 A2 1076  
14 A2 695   A2   assignment questionable (listed as 981)
15 A2 157 -36 A2 193  
16 B1 2906 -39 B1 2945  
17 B1 1460 16 B1 1444  
18 B1 1094 15 B1 1079  
19 B1 943 53 B1 890  
20 B1 433 4 B1 429  
21 B1 201 5 B1 196  
22 B2 3047 -39 B2 3086  
23 B2 2945 -35 B2 2980  
24 B2 2861 -32 B2 2893  
25 B2 1455 -3 B2 1458  
26 B2 1397 16 B2 1381  
27 B2 1268 -14 B2 1282  
28 B2 961 -82 B2 1043  
29 B2 939 -35 B2 974  
30 B2 427 -3 B2 430  
The calculated vibrational frequencies were scaled by 0.9085

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.