Laser optogalvanic measurements and line-shape analysis of 5p57p and 5p54–5f autoionizing resonances in xenon

Abstract

We present new measurements of the even parity autoionizing resonances built on the 5p57p and 5p54f configurations in xenon using the laser optogalvanic detection technique in conjunction with a dc discharge cell. The autoionizing resonances 5p57p[1/2]1 and 5p57p[3/2]1 excited from the 5p56s[1/2]0 metastable level and the 5p57p[3/2]2 resonance excited from the 5p56s[1/2]1 resonance level have been studied. In addition, the 5p5(2P1/2)nf (n = 4 and 5) autoionizing resonances excited from the collisionally populated levels of the 5p55d configuration have been investigated. The J-value assignments are established in the light of the selection rules in the jK-coupling scheme. We have determined the resonance energies, quantum defects, line-shape parameters and resonance widths by fitting the observed resonance profiles using Fano's formula for the photoionization cross section.