return to home page

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

Compare vibrational frequencies in CCCBDB for C3H2N2 (Malononitrile)

MP2/cc-pV(T+d)Z

Frequency in cm-1
  Calculated   Experimental
Mode Number Symmetry Frequency diff Symmetry Frequency Comment
1 A1 2956 21 A1 2935  
2 A1 2102 -173 A1 2275  
3 A1 1394 -1 A1 1395  
4 A1 862 -28 A1 890  
5 A1 547 -35 A1 582  
6 A1 134 -33 A1 167  
7 A2 1199 -21 A2 1220  
8 A2 332 -35 A2 367  
9 B1 3005 37 B1 2968  
10 B1 894 -39 B1 933  
11 B1 307 -30 B1 337  
12 B2 2107 -168 B2 2275  
13 B2 1281 -37 B2 1318  
14 B2 949 -33 B2 982  
15 B2 337 -29 B2 366  
The calculated vibrational frequencies were scaled by 0.9525

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.