Reduction formula for point group C2h
Characters for molecular motions
| Motion |
E |
C2 (z) |
i |
 h |
| Cartesian 3N |
324 |
0 |
0 |
12 |
| Translation (x,y,z) |
3 |
-1 |
-3 |
1 |
| Rotation (Rx,Ry,Rz) |
3 |
-1 |
3 |
-1 |
| Vibration |
318 |
2 |
0 |
12 |
Decomposition into Irreducible representations
| Motion |
Ag |
Bg |
Au |
Bu |
Total |
| Cartesian 3N |
84 |
78 |
78 |
84 |
324 |
| Translation (x,y,z) |
0 |
0 |
1 |
2 |
3 |
| Rotation (Rx,Ry,Rz) |
1 |
2 |
0 |
0 |
3 |
| Vibration |
83 |
76 |
77 |
82 |
318 |
Molecule Parameter
| Number of Atoms (N) |
108 |
| Number of internal coordinates |
318 |
| Number of independant internal coordinates |
83 |
| Number of vibrational modes |
318 |
Force field analysis
Allowed / forbidden vibronational transitions
| Operator |
Ag |
Bg |
Au |
Bu |
Total |
| Linear (IR) |
83 |
76 |
77 |
82 |
159 / 159 |
| Quadratic (Raman) |
83 |
76 |
77 |
82 |
159 / 159 |
| IR + Raman |
- |
- |
- |
- |
0* / 0 |
* Center of inversion: Mutual Exclusion Principle
Characters of symmetric powers for vibration representation
| Force field |
Tensor
Order |
E |
C2 (z) |
i |
h |
| linear |
1 |
318 |
2 |
0 |
12 |
| quadratic |
2 |
50.721 |
161 |
159 |
231 |
| cubic |
3 |
5.410.240 |
320 |
0 |
2.200 |
| quartic |
4 |
434.171.760 |
13.040 |
12.720 |
25.080 |
| quintic |
5 |
27.960.661.344 |
25.760 |
0 |
201.432 |
| sextic |
6 |
1.505.215.602.352 |
708.400 |
682.640 |
1.748.824 |
Decomposition into Irreducible representations
Number of nonvanshing force constants
| Force field |
Tensor
Order |
Ag |
Bg |
Au |
Bu |
| linear |
1 |
83 |
76 |
77 |
82 |
| quadratic |
2 |
12.818 |
12.622 |
12.623 |
12.658 |
| cubic |
3 |
1.353.190 |
1.351.930 |
1.352.090 |
1.353.030 |
| quartic |
4 |
108.555.650 |
108.536.590 |
108.536.750 |
108.542.770 |
| quintic |
5 |
6.990.222.134 |
6.990.108.538 |
6.990.121.418 |
6.990.209.254 |
| sextic |
6 |
376.304.685.554 |
376.303.456.942 |
376.303.469.822 |
376.303.990.034 |
Literature
- J.K.G. Watson, J. Mol. Spec. 41 229 (1972)
The Numbers of Structural Parameters and Potential Constants of Molecules
- X.F. Zhou, P. Pulay. J. Comp. Chem. 10 No. 7, 935-938 (1989)
Characters for Symmetric and Antisymmetric Higher Powers of Representations:
Application to the Number of Anharmonic Force Constants in Symmetrical Molecules
Last update November, 13th 2023 by A. Gelessus, Impressum, Datenschutzerklärung/DataPrivacyStatement