caa a22 4500 44586706X CHVBK 20180317145501.0 cr unu---uuuuu 170323e20111201xx s 000 0 eng 10.1140/epjd/e2011-20277-x doi (NATIONALLICENCE)springer-10.1140/epjd/e2011-20277-x Basu A. Department of Physics, Maheshtala College, Budge Budge Trunk Road, Kolkata- 700 141, West Bengal, India aut Lowest lying doubly-excited P-and D-state resonances of Ps− in weakly coupled plasmas [Elektronische Daten] [A. Basu] Abstract.: The lowest-lying 1, 3Po and 1De resonances of positronium negative ion, Ps−, in weakly coupled plasmas have been investigated employing the close-coupling approximation. Three different basis sets have been employed in the present study. The plasma screening condition obtained from the Debye-Hückel type potential is used to represent the interaction between the charged particles. The resonance energies and the corresponding widths of one 1Po, two 3Po, and one 1De resonant states associated with the n=2 threshold of the positronium atom for various Debye lengths ranging from infinity to small values are reported. The 1Po resonance as well as the higher lying 3Po resonant state transforms to a shape resonance for denser plasma conditions. The 1De resonant state also changes to a shape-type resonance for very dense plasmas. EDP Sciences, SIF, Springer-Verlag Berlin Heidelberg, 2011 The European Physical Journal D Springer-Verlag 65/3(2011-12-01), 405-410 1434-6060 65:3<405 2011 65 10053 https://doi.org/10.1140/epjd/e2011-20277-x text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1140/epjd/e2011-20277-x text/html Onlinezugriff via DOI NATIONALLICENCE 100 1- Basu A. Department of Physics, Maheshtala College, Budge Budge Trunk Road, Kolkata- 700 141, West Bengal, India aut NATIONALLICENCE 773 0- The European Physical Journal D Springer-Verlag 65/3(2011-12-01), 405-410 1434-6060 65:3<405 2011 65 10053 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer