Reduction formula for point group D2

Your representation

E C2 (z) C2 (y) C2 (x)
12 0 0 0

can be reduced to

A B1 B2 B3
3 3 3 3

Substraction of translational and rotational contributions results in

A B1 B2 B3
3 1 1 1



Force field analysis

Infrared and Raman activities (harmonic approximation)
Method A B1 B2 B3
Infrared - + + +
Raman + + + +

Number of force field parameters
Force field No. 1 No. 2 No. 3
linear 6 6 3
quadratic 36 21 9
cubic 216 56 20
quartic 1296 126 42
No. 1 : Total number of force constants .
No. 2 : Total number of force constants k.
No. 3 : Total number of nonvanishing force constants k.

Symmetry properties of force field parameters
Force field A B1 B2 B3
linear 3 1 1 1
quadratic 9 4 4 4
cubic 20 12 12 12
quartic 42 28 28 28

Number of independant internal coordinates 3

Literature




Character tables for chemically important point groups Character table for point group D2 Jacobs University Bremen