Eur. Phys. J. D (2017) 71: 100
https://doi.org/10.1140/epjd/e2017-70639-3

Regular Article

Study of electron excitation of Rb-like to Br-like tungsten ions and polarization of their photon emission^*

Department of Physics, Indian Institute of Technology Roorkee, Roorkee 247667, India

^a e-mail: lalitfph@iitr.ac.in

Received: 13 October 2016
Received in final form: 26 December 2016
Published online: 25 April 2017

Abstract

A systematic study of the electron impact excitation of highly charged Rb-like W³⁷⁺ through Br-like W³⁹⁺ tungsten ions has been done using fully relativistic distorted wave theory. The cross sections are calculated for various transitions in the electron impact energy range from the excitation threshold to 20 keV. Analytic fitting of the calculated cross sections are also provided so that these can be directly used in any plasma model. Linear polarization of the emitted photons, due to decay of the different electron excited states of the tungsten ions has also been obtained and reported.