Abstract
Two photon transitions from the 5
2
P
0
½
and 5
2
P
0
3/2
states of In have been observed to high lying
2
P
0
and
2
F
0
states. Extended series corresponding to P
0
→
n
P
0
and P
0
→
n
F
0
transitions are seen to
n
= 23 and
n
= 31 respectively. A hybrid resonance through intermediate states of In
2
gives rise to a series 6s
2
S →
n
p
2
P
0
which can be followed to
n
= 42. Resonant enhancement of the 5
2
P
0
3/2
→
n
p
2
P
0
series occurs because of an intermediate
2
S state. This produces a singularity in the cross section for this transition. Possible two photon transitions to autoionizing states of In are also seen.
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