Eur. Phys. J. D (2016) 70: 265
https://doi.org/10.1140/epjd/e2016-70518-5

Regular Article

S-wave resonances below the Ps(n = 2) excitation threshold of the e⁺ − He system embedded in Debye plasma

¹ Department of Mathematics, Burdwan University, Golapbag, 713 104 Burdwan, West Bengal, India
² Institute of Atomic and Molecular Sciences, Academia Sinica, P.O. Box 23-166, 106 Taipei, Taiwan

^a e-mail: arijit98@yahoo.com

Received: 17 August 2016
Received in final form: 7 October 2016
Published online: 15 December 2016

Abstract

S-wave resonances in positron-helium system, embedded in Debye plasma, have been investigated using the stabilization method. The interactions among the charged particles in the plasma have been represented by Debye-Huckel potentials. A model potential has been used to describe the interaction between the outer electron with the He⁺ ionic core. Two resonances below the Ps(n = 2) − He⁺ threshold have been identified. For the unscreened case, our results are in nice agreement with some of the most accurate results available in the literature. To the best of our knowledge, such an investigation on S-wave resonance states, lying below the Ps(n = 2) excitation threshold, of the positron-helium system embedded in Debye plasma environment is the first reported in the literature.