Characters of representations for molecular motions
Motion |
E |
C4 |
C2 |
(C4)3 |
Cartesian 3N |
39 |
5 |
-5 |
5 |
Translation (x,y,z) |
3 |
1 |
-1 |
1 |
Rotation (Rx,Ry,Rz) |
3 |
1 |
-1 |
1 |
Vibration |
33 |
3 |
-3 |
3 |
Decomposition to irreducible representations
Motion |
A |
B |
E*
|
Total |
Cartesian 3N |
11 |
6 |
11 |
28 |
Translation (x,y,z) |
1 |
0 |
1 |
2 |
Rotation (Rx,Ry,Rz) |
1 |
0 |
1 |
2 |
Vibration |
9 |
6 |
9 |
24 |
Molecular parameter
Number of Atoms (N) |
13
|
Number of internal coordinates |
33
|
Number of independant internal coordinates |
9
|
Number of vibrational modes |
24
|
Force field analysis
Allowed / forbidden vibronational transitions
Operator |
A |
B |
E*
|
Total |
Linear (IR) |
9 |
6 |
9 |
18 / 6 |
Quadratic (Raman) |
9 |
6 |
9 |
24 / 0 |
IR + Raman |
9 |
- - - - |
9 |
18 / 0 |
Characters of force fields
(Symmetric powers of vibration representation)
Force field |
E |
C4 |
C2 |
(C4)3 |
linear |
33 |
3 |
-3 |
3 |
quadratic |
561 |
3 |
21 |
3 |
cubic |
6.545 |
1 |
-55 |
1 |
quartic |
58.905 |
9 |
225 |
9 |
quintic |
435.897 |
27 |
-531 |
27 |
sextic |
2.760.681 |
27 |
1.653 |
27 |
Decomposition to irreducible representations
Column with number of nonvanshing force constants highlighted
Force field |
A |
B |
E*
|
linear |
9 |
6 |
9 |
quadratic |
147 |
144 |
135 |
cubic |
1.623 |
1.622 |
1.650 |
quartic |
14.787 |
14.778 |
14.670 |
quintic |
108.855 |
108.828 |
109.107 |
sextic |
690.597 |
690.570 |
689.757 |
Further Reading
- 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
- F. Varga, L. Nemes, J.K.G. Watson. J. Phys. B: At. Mol. Opt. Phys. 10 No. 7, 5043-5048 (1996)
The number of anharmonic potential constants of the fullerenes C60 and C70
Contributions to nonvanishing force field constants
pos(X) : Position of irreducible representation (irrep) X in character table of C
4
Subtotal: <Number of nonvanishing force constants in subsection> / <number of nonzero irrep combinations in subsection> / <number of irrep combinations in subsection>
Total: <Number of nonvanishing force constants in force field> / <number of nonzero irrep combinations in force field> / <number of irrep combinations in force field>
Contributions to nonvanishing quadratic force field constants
Irrep combinations (i,i) with indices: pos(A) ≤ i ≤ pos(E) |
..45. |
AA. | ..21. |
BB. | ..81. |
EE. | | |
| |
| |
| |
| |
| |
| |
Subtotal: 147 / 3 / 3 |
Irrep combinations (i,j) with indices: pos(A) ≤ i ≤ j ≤ pos(E) |
Subtotal: 0 / 0 / 3 |
Total: 147 / 3 / 6 |
Contributions to nonvanishing cubic force field constants
Irrep combinations (i,i,i) with indices: pos(A) ≤ i ≤ pos(E) |
..165. |
AAA. | | |
| |
| |
| |
| |
| |
| |
| |
| |
Subtotal: 165 / 1 / 3 |
Irrep combinations (i,i,j) (i,j,j) with indices: pos(A) ≤ i ≤ j ≤ pos(E) |
..189. |
ABB. | ..729. |
AEE. | ..540. |
BEE. | | |
| |
| |
| |
| |
| |
| |
Subtotal: 1.458 / 3 / 6 |
Irrep combinations (i,j,k) with indices: pos(A) ≤ i ≤ j ≤ k ≤ pos(E) |
Subtotal: 0 / 0 / 1 |
Total: 1.623 / 4 / 10 |
Contributions to nonvanishing quartic force field constants
Irrep combinations (i,i,i,i) with indices: pos(A) ≤ i ≤ pos(E) |
..495. |
AAAA. | ..126. |
BBBB. | ..3.015. |
EEEE. | | |
| |
| |
| |
| |
| |
| |
Subtotal: 3.636 / 3 / 3 |
Irrep combinations (i,i,i,j) (i,j,j,j) with indices: pos(A) ≤ i ≤ j ≤ pos(E) |
Subtotal: 0 / 0 / 6 |
Irrep combinations (i,i,j,j) with indices: pos(A) ≤ i ≤ j ≤ pos(E) |
..945. |
AABB. | ..3.645. |
AAEE. | ..1.701. |
BBEE. | | |
| |
| |
| |
| |
| |
| |
Subtotal: 6.291 / 3 / 3 |
Irrep combinations (i,i,j,k) (i,j,j,k) (i,j,k,k) with indices: pos(A) ≤ i ≤ j ≤ k ≤ pos(E) |
..4.860. |
ABEE. | | |
| |
| |
| |
| |
| |
| |
| |
| |
Subtotal: 4.860 / 1 / 3 |
Irrep combinations (i,j,k,l) with indices: pos(A) ≤ i ≤ j ≤ k ≤ l ≤ pos(E) |
Subtotal: 0 / 0 / 0 |
Total: 14.787 / 7 / 15 |
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Last update November, 13th 2023 by A. Gelessus, Impressum, Datenschutzerklärung/DataPrivacyStatement