title: Spectroscopy of even-parity autoionizing levels in Ba.
abstract: Using multiphoton ionization spectroscopy, we have observed transitions in Ba from the 6s(2)(1)S(0) 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 5d(2)D(3/2) and (2)D(5/2) ionization limits. A multichannel quantum-defect theory analysis of the J = 0 spectrum is presented.
authors.forename: J J
authors.initials: JJ
authors.lastname: Wynne
authors.forename: J P
authors.initials: JP
authors.lastname: Hermann