Abstract
Fine structure calculations of the energy levels, the wavelengths, the oscillator strengths, log gf and the transition probabilities for transitions among the terms belonging to 1s2 2s2 2p6 3s2 3p6 3d104s2ns, n=5-6, 1s2 2s2 2p6 3s2 3p6 3d104s2np, n=4-6, 1s2 2s2 2p6 3s2 3p6 3d104s2nd, n=4-6 and1s2 2s2 2p6 3s2 3p6 3d104s2nf, n=4-6 configurations of As (III) have been calculated using configurations interaction Cowan atomic structure code. Our calculated values for the above mentioned quantities have been compared with the corresponding experimental data and other theoretical calculations where a satisfactory agreement is found. We also report on some unpublished values for energy levels, oscillator strengths and transition probabilities for As like gallium. These atomic data are taken as the basis for studying laser transitions between levels of As(III). Excitation rate coefficients of As like gallium are calculated using the analytical formulas of Vriens and Smeets (1980) and with considering using the collisional radiative model code CRMO of Allam (2006). A simple modification to these formulas has been included by introducing effective quantum numbers. The energy values, the radiative data and rate coefficients are then used to calculate the population densities by solving the coupled rate equations. Among these calculations positive gain coefficients are found at three selected values of electron temperature, namely 7.087 eV, 14.147 eV and 21.261 eV which are displayed as a function of the electron impact density.
Highlights
Spectroscopic data of Gallium [1, 2] and Gallium-like ions [3,4,5] may be of interest for plasma investigations in controlled thermonuclear fusion experiments
Gallium isoelectronic sequence has been studied for some transitions using the configuration interaction approach [8]
The purpose of this paper is to report new calculations involving higher energy levels, wavelengths, oscillator strengths and transition probabilities that are not calculated before beside the precalculated data to indicate the reliabilities of the new ones by making comparisons with the available theoretical and experimental data
Summary
Spectroscopic data of Gallium [1, 2] and Gallium-like ions [3,4,5] may be of interest for plasma investigations in controlled thermonuclear fusion experiments. Multicharged ion spectra of the Gallium isoelectronic sequence (Z35) have been analyzed. Spectra of the Rb(VII) ion emitted from sparks and laser-produced plasmas have been investigated [6]. The first six elements of the gallium sequence have been calculated using the multiconfiguration optimized potential model [7]. Multiconfiguration Dirac-Fock calculations on multi-valence-electron systems have been performed for Ga-like ions [9]. Spectra of the gallium-like ions excited by low-inductance sparks and laser-produced plasmas were observed [10]. The energy levels and observed spectral lines of Krypton, Kr I through Kr XXXVI have been studied [12]
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