Bound and Resonance States of Highly Charged H- and He-like Ions Under Dense Quantum Plasma Environment

Abstract

The impact of the dense quantum plasma on the bound (1sns; \(^1\)S\(^e\)) [\(n=1-5\)] and a few low-lying doubly excited resonance (2sns, 2pnp; \(^1\)S\(^e\)) [\(n=2-3\)] states of various two-electron highly charged He-like C\(^{4+}\), Mg\(^{10+}\), Al\(^{11+}\), Si\(^{12+}\), S\(^{14+}\) and Ar\(^{16+}\) ions has been studied using an explicitly correlated multi-exponent Hylleraas type basis set under the framework of Ritz variational method. Utilizing the state-of-art stabilization technique, the bound states properties and the resonance parameters (energy and width) are determined under different plasma conditions. Ionization potential depression with respect to the plasma screening length is rigorously investigated for both the bound and resonance states. The width (or the lifetime) of the resonance states originating from different electronic configurations follows unique patterns with respect to the plasma screening length. Most of the data for the resonance parameters are being reported here for the first time in the literature.