Inter-nuclear distance
G
S
1
v 0
v 1
v 2
v 3
v
1
0
v
1
1
v
1
2
v
1
3
Electronic transitions from the ground state to the excited state
Shaded areas reflects the
probability of where the
electron would be if it
were in that vibrational band
Most favored transitions
occur
From
the
Maximum Shaded areas of
the ground state
To
the maximum shaded
areas of the excited state
GM
Electronic Transitions