Abstract
Two-color multiphoton excitation spectra of autoionizing ( 1D 2) ns and nd Rydberg series in atomic iodine are presented in the region of the I + 1D 2 ionization threshold. The first laser is used to produce atomic iodine by photodissociation of methyl iodide and to pump the iodine atoms to low-lying ( 1D 2) 6p states via a two-photon transition. The second laser excites single photon transitions from these states to autoionizing Rydberg series, resolved to n ≈ 35. Extension of this technique for other open shell atoms is discussed.
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