Radiative and Auger de-excitation of hollow argon atoms

Abstract

We report here on extensive calculations of radiative and autoionization transition rates, x-ray wavelengths and fluorescence yields of hollow argon atoms with configurations with m = 0 - 2 and n = 1 - 6. The calculations have been performed in the intermediate coupling scheme using the multiconfiguration Hartree - Fock atomic model.

Systematic Studies on the Inter-Combination Lines of He-like to O-like Argon

“…The length form weighted absorption oscillator strengths for various initial states are also listed in these tables. Also included in Tables I and II are the few other values that are available in literature [7]. Karim et al [7] used multi configuration Hartree Fock (MCHF) wavefunctions and included relativistic corrections in their calculations.…”

“…However, no systematic relativistic calculations on the spin-forbidden lines of atoms ionized doubly in the K shell exist. Recently, Karim et al [7] have reported their multiconfiguration Hartree-Fock (MCHF) calculations on the various electric dipole transitions of argon with double ionization in the K shell and multiple ionization in the L shell. In this paper, we present a complete set of calculations of the transition parameters for all the electric dipole spin forbidden lines in the 2s p 2p q !…”

Multi-configuration Dirac-Fock and configuration-interaction calculations of Ar7+to Ar17+ions

“…As the difference in the energies of the states of various configurations evaluated using MCDF and RCI methods is quite small, we have reported in table 4 the ranges in the energy values, calculated in the configuration-interaction formalism of the different transitions, arising from the three initial configurations 1s 0 1/2 2s 0 1/2 2p m 1/2 2p n 3/2 , 1s 0 1/2 2s 1 1/2 2p m 1/2 2p n 3/2 and 1s 0 1/2 2s 2 1/2 2p m 1/2 2p n 3/2 with m+n = 1-6. Also included in this table are the MCHF energy ranges of the K x-rays originating from states of 1s 0 2s 0 2p m , 1s 0 2s 1 2p m and 1s 0 2s 2 2p m (m = 1-6) configurations of argon reported by Karim et al [4]. As the present calculations on the K xray hypersatellite energies and the non-relativistic K x-ray energies of Karim et al cannot be directly compared, we have made an attempt to compare only the energy ranges of the different groups of transitions.…”

“…For a proper interpretation of the experimentally observed spectra in the stellar and laboratory induced high-temperature plasmas, accurate data on the atomic transitions of highly ionized atoms are needed. Recently, Karim et al [4] have reported their extensive multi-configuration Hartree-Fock calculations on the K α x-ray and K-LL Auger hypersatellite spectra of argon arising due to the decay of hollow argon atoms. As relativistic and configuration interactions are found to have significant influence on the atomic parameters of highly ionized atoms [5][6][7], in this work we have carried out multi-configuration Dirac-Fock (MCDF) and relativistic configurationinteraction (RCI) calculations.…”

Argon 1s −2 Auger hypersatellites

“…Chen calculated the K −2 hypersatellite Auger spectrum as well as the core-hole lifetimes [18], while Dyall [22] calculated the population probability for the creation of KK and KL double core holes as a shake satellite of the Ar 1s −1 photoionisation. Moreover, Karim et al [23] calculated the radiative and non-radiative decay of hollow argon atoms. Experimentally, Mikkola and Ahopelto [24] studied the radiative Kα h hypersatellite spectrum of K −2 DCH state and Raboud et al [25] the x-ray hypersatellite spectrum of the KL mixed DCH spectrum.…”