Investigations of Highly Ionized Atoms Using Fast Ions and Laser Produced Plasmas with Astrophysical Applications

摘要

Lifetime measurements using the beam-foil technique have been performed in He-like oxygen and fluorine, Be-like nitrogen and oxygen and Na-like sulphur and chlorine. Hyperfine induced decay of the 1s2p sup 3 P sub 0 level in F VIII has been observed. Accurate oscillator strengths of the 2s sup 2 sup 1 S-2s2p sup 1 P transition in N IV and O V and 3s sup 2 S-3P sup 2 sp(p) transition in S VI and Cl VII have been obtained. Spectropic studies in highly ionized F, S, C and the iron group elements from K to Ni using sparks, beam foil technique and laser produced plasmas have been undertaken. The spectra of Cl VII and Cl VIII have been studied in the wavelength region 100-6000 Aa. The Ne-like sp sup 5 3s, 3p and 3d configurations have been studied up to Fe XVII. Along with these experimental studies ab initio relativistic calculations for isoelectronic comparisons have been performed. The 2p sup 4 3s, 3p and 3d configurations have been analysed in S VIII, Cl IX and Ti XIV. Based on isoelectronic extrapolation identification of Fe XVII and Ni XIX in solar flares has been made. With 69 refs. (Atomindex citation 17:045777)