title: Modeling energy dependence of the inner-shell x-ray emission produced by femtosecond-pulse laser irradiation of xenon clusters.
abstract: We employ the Los Alamos suite of atomic physics codes to model the inner-shell x-ray emission spectrum of xenon and compare results with those obtained via high-resolution x-ray spectroscopy of xenon clusters irradiated by 30fs Ti:Sapphire laser pulses. We find that the commonly employed configuration-average approximation breaks down and significant spin-orbit splitting necessitates a detailed level accounting. We reproduce an interesting spectral trend for a series of experimental spectra taken with varying pulse energy for fixed pulse duration. To simulate the experimental measurements at increasing beam energies, we find that spectral modeling requires an increased hot electron fraction, but decreased atomic density and bulk electron temperature. We believe these latter conditions to be a result of partial cluster destruction due to the increased energy in the laser prepulse.
authors.affiliation: Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: Timothy C
authors.initials: TC
authors.lastname: Berkelbach
authors.forename: James
authors.initials: J
authors.lastname: Colgan
authors.forename: Joseph
authors.initials: J
authors.lastname: Abdallah
authors.forename: Anatoly Ya
authors.initials: AY
authors.lastname: Faenov
authors.forename: Tatiana A
authors.initials: TA
authors.lastname: Pikuz
authors.forename: Yuji
authors.initials: Y
authors.lastname: Fukuda
authors.forename: Koichi
authors.initials: K
authors.lastname: Yamakawa