Energy Levels, Oscillator Strengths, and Transition Probabilities of Ni XIX and Cu XX

Wessameldin S Abdelaziz,Laila Gaabour,M Atta Khedr,Tharwat El-Shirbini,Mai E Ahmed

doi:10.4236/opj.2014.43008

Wessameldin S Abdelaziz, Laila Gaabour + Show 3 more

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https://doi.org/10.4236/opj.2014.43008

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Abstract

Energy levels, oscillator strengths, and transition probabilities, for the 1s2 2s2 2p6, 2p53l (l = 0, 1, 2), 2p54l (l = 0, 1, 2, 3) states in Ni XIX and Cu XX are calculated using COWAN code. The Correlation and relativistic effects are considered. The calculations are compared with other results in the literature. A good agreement is found. We also report on some unpublished energy values.

Highlights

Almost coincident with the first observations of laser action in the IR and visible spectral regions in the 1960s, the search started for lasers operating at much shorter wavelengths
Adopting the program RCN/RCG [10], we have computed the parameters of atomic structures of Ni XIX and Cu XX respectively
We show that there is a good agreement between our results which were obtained by using COWAN code and the other values from NIST

Summary

Introduction

Almost coincident with the first observations of laser action in the IR and visible spectral regions in the 1960s, the search started for lasers operating at much shorter wavelengths. Measurements of definitive high output lasing at wavelength shorter than the ultra-violet were elusive, until the mid 1980s when conclusive evidence for “X-ray laser” operating at 209 Å was produced from neon-like selenium [1]. Due to their peculiar structure of closed shells, Ne-like ions have been widely applied in the laboratory and in astronomical plasmas. The laboratory application is shown by the successful X-ray laser in the energy level of 2p5 3p-2p5 3s of Ne-like ions based on the mechanism of collisional excitation of electros [2].

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