Spectroscopy of even-parity autoionizing levels in Ba
1979
Using multiphoton ionization spectroscopy, we have observed transitions in Ba
from the 6s2 1S0 ground
state to even-parity autoionizing states. We have seen extended series with
J = 0, 1, and 2 of the type 5dnd
and 5dns, converging on the 5d2D3/2 and
2D5/2 ionization limits. A
multichannel quantum-defect theory analysis of the J =
0 spectrum is presented.
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