Two-colour studies of the even-parity autoionization series 5p⁵_1/2nell′(ell = p, f) in atomic xenon

Abstract

Two-colour experiments combining synchrotron radiation and light pulses from a synchronized linear dye laser have been performed to investigate even-parity Xe* 5p5(2P1/2) np′ and nf′ resonances of atomic xenon. These autoionization states have been reached through a double-resonant excitation scheme including the short-lived intermediate states Xe* 5p5(2P3/2) 5d and 6d. Our theoretical results reproduce the experimental findings, especially the observed dramatic suppression of the np′ resonances, by taking into account strong configuration interaction in the intermediate and the final states. Moreover, theory reveals that asymmetry parameters and oscillator strengths for the 5p5nf′ and 5p5np′ series are strongly dependent on the description of the intermediate states. The measured and calculated values for the reduced widths and the quantum defects of the 5p5nf′ series are in good agreement.

Combination of lasers and synchrotron radiation in studies of atomic photoionization

“…The 5d-4f 0 excitation leads to an asymmetric profile with a q-parameter of 3.4, whereas the 6s-4f 0 shows an almost symmetrical profile indicating that the resonant excitation is much stronger than the direct ionization process. The experimental values are well reproduced by theoretical results [41], which underline the importance of configuration mixing in the intermediate states. That at least the 6s intermediate state has to be described by a mixed configuration is already obvious from the observation of the s-f transition.…”

“…the much stronger intensity of the SU line compared to the ML, but did not give the correct energy dependence in the region close to threshold. The experimental investigations [41] could verify in this case the theoretical predictions. More interesting is the energy dependence of the CSU Li + 1s4s satellites (Fig.…”

“…The possibility to change easily the photon energy in the first step, and thereby to choose different intermediate states has opened the way for a systematic study of the final np 0 and nf 0 resonances in Kr and Xe [41,42] complementary to other studies starting from metastable intermediate states (e.g. [43,44]).…”

Two-color visible/vacuum ultraviolet photoelectron imaging dynamics of Br2

“…4 Recently, Meyer and co-workers published a two-color photoionization study combining synchrotron radiation and light pulses from a synchronized dye laser to investigate the autoionization of Xe * resonances. 5 A double excitation scheme was employed using the shortlived intermediate states of Xe * . Very recently, Lee et al studied the two-photon double-resonant photoionization of Ar and Xe to autoionizing Rydberg states lying between the 2 P 3/2 and 2 P 1/2 thresholds with the combination of a femtosecond Ti:sapphire laser system and vacuum ultraviolet ͑VUV͒ synchrotron radiation.…”

Photoionization of Synchrotron-Radiation-Excited Atoms: Separating Partial Cross Sections by Full Polarization Control

“…The data for the widths and profile indices give further challenges for ab initio theoretical calculations: the recent configuration interaction polarizedcore semirelativistic calculations of reduced widths [31] deviate significantly from the measured values, while the profile indices, which need even more sophisticated calculations, are not available in the literature.…”