Eur. Phys. J. D 44, 1-8 (2007)
https://doi.org/10.1140/epjd/e2007-00141-6

The ground state and doubly-excited ^1,3P° states of hot-dense plasma-embedded Li⁺ ions

Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23, Taipei, 106, Taiwan

Corresponding author: ^a skar@pub.iams.sinica.edu.tw

Received: 10 November 2006
Revised: 20 January 2007
Published online: 6 April 2007

Abstract

We have investigated the ground state and the doubly excited ^1,3P^○ resonance states of plasma-embedded Li⁺ ion. The plasma effect is taken care of by using a screened Coulomb potential obtained from the Debye model. A correlated wave function has been used to represent the correlation effect between the charged particles. The ground state of Li⁺ in plasmas for different screening parameters has been estimated in the framework of Rayleigh-Ritz variational principle. In addition, a total of 18 resonances (9 each for ¹P^○ and ³P^○ states) below the n=2 Li⁺ thresholds has been estimated by calculating the density of states using the stabilization method. For each spin state, this includes four members in the 2snp₊ (2≤n ≤5) series, three members in the 2snp_- (3≤n ≤5) series, and two members in the 2pnd (n=3, 4) series. The resonance energies and widths for various Debye parameters ranging from infinity to a small value for these ^1,3P^○ resonance states along with the ground state energies of Li⁺ and the Li²⁺ (1S), Li²⁺ (2S) threshold energies are reported. Furthermore, the wavelengths for the photo-absorption of lithium ion from its ground state to such ¹P^○ resonance states for different Debye lengths are also reported.