Reduction formula for point group C2h

Reduction formula for point group C_2h

**Characters for molecular motions**
Motion	E	C₂ (z)	i	_h
Cartesian 3N	18	0	0	6
Translation (x,y,z)	3	-1	-3	1
Rotation (R_x,R_y,R_z)	3	-1	3	-1
Vibration	12	2	0	6

**Decomposition into Irreducible representations**
Motion	A_g	B_g	A_u	B_u	Total
Cartesian 3N	6	3	3	6	18
Translation (x,y,z)	0	0	1	2	3
Rotation (R_x,R_y,R_z)	1	2	0	0	3
Vibration	5	1	2	4	12

**Molecule Parameter**
Number of Atoms (N)	6
Number of internal coordinates	12
Number of independant internal coordinates	5
Number of vibrational modes	12

Force field analysis

**Allowed / forbidden vibronational transitions**
Operator	A_g	B_g	A_u	B_u	Total
Linear (IR)	5	1	2	4	6 / 6
Quadratic (Raman)	5	1	2	4	6 / 6
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	12	2	0	6
quadratic	2	78	8	6	24
cubic	3	364	14	0	74
quartic	4	1.365	35	21	195
quintic	5	4.368	56	0	456
sextic	6	12.376	112	56	976

Decomposition into Irreducible representations
Number of nonvanshing force constants
Force field	Tensor Order	A_g	B_g	A_u	B_u
linear	1	5	1	2	4
quadratic	2	29	13	14	22
cubic	3	113	69	76	106
quartic	4	404	289	296	376
quintic	5	1.220	964	992	1.192
sextic	6	3.380	2.836	2.864	3.296

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

Character tables for chemically important point groups

Character table for point group C2h

Constructor University Bremen

Last update November, 13^th 2023 by A. Gelessus, Impressum, Datenschutzerklärung/DataPrivacyStatement