Spontaneous symmetry breaking

Intrinsic symmetries
5 - ν=1
3 -
1 -
(parallel band)
D •h (C 2 , P)
O
C
O
6 +
4 +
2 +
0 +
ν=0
(ground band)
CO 2
- an axially symmetric molecule with no static dipole moment.
O
C
O
C •ν (S=C 2 P)
3 -
2 +
O N
4 +
1 -
0 +
N 2
O - an axially symmetric molecule with static dipole moment.