Abstract
We report new measurements of the odd-parity autoionizing resonances in krypton using resonant two-photon excitation from the 4p55s[3/2]2 metastable level in a mild DC discharge and an optogalvanic detection technique. We have observed the 4p5ns [1/2]0,1, 4p5nd [3/2]2 and 4p5nd [5/2]2,3 autoionizing resonances excited from three intermediate levels 4p55p′ [1/2]1, 4p55p′ [3/2]1 and 4p55p′ [3/2]2. The spectra are notable for the absence of the broad autoionizing 4p5nd [3/2]1 series which dominates in the photo-absorption spectrum from the ground state. The prominent transitions follow ΔK = ΔJ = Δl selection rules of the JK-coupling scheme. We report nearly 100 new energy levels in krypton besides the quantum defects and the reduced widths Γr = Γ(ν)3 of the nd′ [3/2]2, nd′ [5/2]2 and nd′ [5/2]3 Rydberg states.
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