Reduction formula for point group C2v
Characters for molecular motions
| Motion |
E |
C2 (z) |
 v(xz) |
v(yz) |
| Cartesian 3N |
99 |
-1 |
9 |
9 |
| Translation (x,y,z) |
3 |
-1 |
1 |
1 |
| Rotation (Rx,Ry,Rz) |
3 |
-1 |
-1 |
-1 |
| Vibration |
93 |
1 |
9 |
9 |
Decomposition into Irreducible representations
| Motion |
A1 |
A2 |
B1 |
B2 |
Total |
| Cartesian 3N |
29 |
20 |
25 |
25 |
99 |
| Translation (x,y,z) |
1 |
0 |
1 |
1 |
3 |
| Rotation (Rx,Ry,Rz) |
0 |
1 |
1 |
1 |
3 |
| Vibration |
28 |
19 |
23 |
23 |
93 |
Molecule Parameter
| Number of Atoms (N) |
33 |
| Number of internal coordinates |
93 |
| Number of independant internal coordinates |
28 |
| Number of vibrational modes |
93 |
Force field analysis
Allowed / forbidden vibronational transitions
| Operator |
A1 |
A2 |
B1 |
B2 |
Total |
| Linear (IR) |
28 |
19 |
23 |
23 |
74 / 19 |
| Quadratic (Raman) |
28 |
19 |
23 |
23 |
93 / 0 |
| IR + Raman |
28 |
- |
23 |
23 |
74 / 0 |
Characters of symmetric powers for vibration representation
| Force field |
Tensor
Order |
E |
C2 (z) |
v(xz) |
v(yz) |
| linear |
1 |
93 |
1 |
9 |
9 |
| quadratic |
2 |
4.371 |
47 |
87 |
87 |
| cubic |
3 |
138.415 |
47 |
543 |
543 |
| quartic |
4 |
3.321.960 |
1.128 |
3.288 |
3.288 |
| quintic |
5 |
64.446.024 |
1.128 |
16.344 |
16.344 |
| sextic |
6 |
1.052.618.392 |
18.424 |
77.672 |
77.672 |
Decomposition into Irreducible representations
Number of nonvanshing force constants
| Force field |
Tensor
Order |
A1 |
A2 |
B1 |
B2 |
| linear |
1 |
28 |
19 |
23 |
23 |
| quadratic |
2 |
1.148 |
1.061 |
1.081 |
1.081 |
| cubic |
3 |
34.887 |
34.344 |
34.592 |
34.592 |
| quartic |
4 |
832.416 |
829.128 |
830.208 |
830.208 |
| quintic |
5 |
16.119.960 |
16.103.616 |
16.111.224 |
16.111.224 |
| sextic |
6 |
263.198.040 |
263.120.368 |
263.149.992 |
263.149.992 |
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