Reduction formula for point group C4
Characters for molecular motions
Motion |
E |
C4 |
C2 |
(C4)3 |
Cartesian 3N |
48 |
0 |
0 |
0 |
Translation (x,y,z) |
3 |
1 |
-1 |
1 |
Rotation (Rx,Ry,Rz) |
3 |
1 |
-1 |
1 |
Vibration |
42 |
-2 |
2 |
-2 |
Decomposition into Irreducible representations
Motion |
A |
B |
E |
Total |
Cartesian 3N |
12 |
12 |
12 |
36 |
Translation (x,y,z) |
1 |
0 |
1 |
2 |
Rotation (Rx,Ry,Rz) |
1 |
0 |
1 |
2 |
Vibration |
10 |
12 |
10 |
32 |
Molecule Parameter
Number of Atoms (N) |
16 |
Number of internal coordinates |
42 |
Number of independant internal coordinates |
10 |
Number of vibrational modes |
32 |
Force field analysis
Allowed / forbidden vibronational transitions
Operator |
A |
B |
E |
Total |
Linear (IR) |
10 |
12 |
10 |
20 / 12 |
Quadratic (Raman) |
10 |
12 |
10 |
32 / 0 |
IR + Raman |
10 |
- |
10 |
20 / 0 |
Characters of symmetric powers for vibration representation
Force field |
Tensor Order |
E |
C4 |
C2 |
(C4)3 |
linear |
1 |
42 |
-2 |
2 |
-2 |
quadratic |
2 |
903 |
3 |
23 |
3 |
cubic |
3 |
13.244 |
-4 |
44 |
-4 |
quartic |
4 |
148.995 |
15 |
275 |
15 |
quintic |
5 |
1.370.754 |
-26 |
506 |
-26 |
sextic |
6 |
10.737.573 |
37 |
2.277 |
37 |
Decomposition into Irreducible representations
Number of nonvanshing force constants
Force field |
Tensor Order |
A |
B |
E |
linear |
1 |
10 |
12 |
10 |
quadratic |
2 |
233 |
230 |
220 |
cubic |
3 |
3.320 |
3.324 |
3.300 |
quartic |
4 |
37.325 |
37.310 |
37.180 |
quintic |
5 |
342.802 |
342.828 |
342.562 |
sextic |
6 |
2.684.981 |
2.684.944 |
2.683.824 |
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