Reduction formula for point group C2v
Characters for molecular motions
Motion |
E |
C2 (z) |
v(xz) |
v(yz) |
Cartesian 3N |
21 |
-1 |
7 |
1 |
Translation (x,y,z) |
3 |
-1 |
1 |
1 |
Rotation (Rx,Ry,Rz) |
3 |
-1 |
-1 |
-1 |
Vibration |
15 |
1 |
7 |
1 |
Decomposition into Irreducible representations
Motion |
A1 |
A2 |
B1 |
B2 |
Total |
Cartesian 3N |
7 |
3 |
7 |
4 |
21 |
Translation (x,y,z) |
1 |
0 |
1 |
1 |
3 |
Rotation (Rx,Ry,Rz) |
0 |
1 |
1 |
1 |
3 |
Vibration |
6 |
2 |
5 |
2 |
15 |
Molecule Parameter
Number of Atoms (N) |
7 |
Number of internal coordinates |
15 |
Number of independant internal coordinates |
6 |
Number of vibrational modes |
15 |
Force field analysis
Allowed / forbidden vibronational transitions
Operator |
A1 |
A2 |
B1 |
B2 |
Total |
Linear (IR) |
6 |
2 |
5 |
2 |
13 / 2 |
Quadratic (Raman) |
6 |
2 |
5 |
2 |
15 / 0 |
IR + Raman |
6 |
- |
5 |
2 |
13 / 0 |
Characters of symmetric powers for vibration representation
Force field |
Tensor Order |
E |
C2 (z) |
v(xz) |
v(yz) |
linear |
1 |
15 |
1 |
7 |
1 |
quadratic |
2 |
120 |
8 |
32 |
8 |
cubic |
3 |
680 |
8 |
112 |
8 |
quartic |
4 |
3.060 |
36 |
332 |
36 |
quintic |
5 |
11.628 |
36 |
868 |
36 |
sextic |
6 |
38.760 |
120 |
2.064 |
120 |
Decomposition into Irreducible representations
Number of nonvanshing force constants
Force field |
Tensor Order |
A1 |
A2 |
B1 |
B2 |
linear |
1 |
6 |
2 |
5 |
2 |
quadratic |
2 |
42 |
22 |
34 |
22 |
cubic |
3 |
202 |
142 |
194 |
142 |
quartic |
4 |
866 |
682 |
830 |
682 |
quintic |
5 |
3.142 |
2.690 |
3.106 |
2.690 |
sextic |
6 |
10.266 |
9.174 |
10.146 |
9.174 |
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