approaches the seam of intersections of the singlet
1 B 2
1 A 2
ð Þ and triplet
3 B 2
3 A 2
ð Þ
states with a nonzero velocity component perpendicular to the seam, and despite the
low probability of hopping, the probability of CO 2
1 B 2
1 A 2
ð Þ
ð
Þpredissociation to O
(
3 P) + CO is high.
Fig. 5.21 The potential
energy curves of the XeO
excimer [47]
0.100
0.125
0.150
0
2
4
6
8
O(
3 P)+CO(X
1 Σ
+
)
O(
1 D)+CO(X
1 Σ
+
)
1
A 2
1 B 2
3 A 2
X
1 Σ
+
g
R OC...O , nm
E, eV
3 B 2
Fig. 5.22 Schematic
arrangement of potential
energy curves of the lower
states of a CO 2 molecule as a
function of the OC-O distance
[48]
5.7 Electronic Deactivation
193