Analysis of Mg spectral features produced by irradiations of laser pulses with different contrast and pulse durations

Abstract

Experiments performed at the Leopard Laser Facility at the Nevada Terawatt Facility of the University of Nevada, Reno have produced K-shell Mg spectra with complex satellite features. K-shell Mg spectra were collected from experiments comprised of three different conditions related to laser pulse and contrast. Two spectrometers were fielded: a survey convex spectrometer with a potassium hydrogen phthalate (KAP) crystal (R ∼ 300) and a high resolution focusing spectrometer with spatial resolution using a spherically bent mica crystal (R ∼ 3000). These spectra included dielectronic satellite (DS) lines that were investigated using the quasi-relativistic many-body perturbation theory (MZ) code for previously identified transitions from autoionizing 2lnl states in He-like Mg and new transitions involving autoionizing 1s3lnl states in Li-like Mg and 1s3l3l 3l in Be-like Mg calculated using the Hartree-Fock-relativistic method (COWAN code). Radiative and non-radiative data are combined to obtain branching ratios, intensities and effective emission rate coefficients of DS lines. Synthetic spectra were matched to experimental data to identify strong satellite structures to the Heβ (7.8507 Å) and Lyα (8.4192 Å) resonance transitions.

A quantitative study of the forbidden and intercombination transitions arising from the Li-like Al autoionizing levels

“…By means of perturbation theory, calculations of the DR satellite spectra have been performed for H-like and He-like ions, namely, 2l 3l Ϫ 1s2l, 2l 3l Ϫ 1s3l, and 1s2l 3l Ϫ 1s 2 2l, 1s2l 3l Ϫ 1s 2 3l, respectively, with Z = 6-33 [19], for He-like and Li-like ions, 2lnl Ϫ 1snl , 2lnl Ϫ 1s 2 and 1s2lnl Ϫ 1s 2 nl , 1s2lnl Ϫ 1s 2 2l, respectively, with n = 45, l = 0-1, l= = 0-3, and l== = 0-3 for all Z = 54 [20]. The K-shell Mg spectra have been obtained at the Leopard Laser facility at the Nevada Terawatt Facility of the University of Nevada, Reno, and have been investigated using the quasi-relativistic many-body perturbation theory for autoionizing He-like 2lnl levels and new transitions arising from the Li-like 1s3lnl and Be-like 1s3l3l 3l autoionizing levels have been computed through the use of the Hartree-Fock relativistic method [21].…”