Eur. Phys. J. D 20, 205-209 (2002)
https://doi.org/10.1140/epjd/e2002-00123-2

One and two-photon detachment cross-sections of Ps^-

¹ Department of Physics, University of Crete, Heraklion-Grete 71110, Greece
² Institute of Electronic Structure and Laser, FORTH, P.O. Box 1527, Heraklion-Crete 71110, Greece

Corresponding author: ^a nlambros@iesl.forth.gr

Received: 24 January 2002
Revised: 9 April 2002
Published online: 19 July 2002

Abstract

We present detailed calculations for one- and two-photon above-threshold detachment (ATD) cross-sections of the negative positronium ion Ps, below the threshold of Ps(n=2), using a configuration interaction (CI) method on a B splines basis. Both the one- and two-photon detachment cross-sections have a form similar to the corresponding spectra of the H^- ion, scaled accordingly. The peak value of the one-photon cross-section agrees very well with the calculations by Bathia and Drachman [1], while it differs from those by Igarashi et al. [2], which give a value of 15% lower. Two-photon detachment cross-sections are also reported.