One and two-photon detachment cross-sections of Ps- |
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| Authors: | K Maniadaki LAA Nikolopoulos P Lambropoulos |
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| Institution: | (1) Department of Physics, University of Crete, Heraklion-Grete 71110, Greece, GR;(2) Institute of Electronic Structure and Laser, FORTH, P.O. Box 1527, Heraklion-Crete 71110, Greece, GR |
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| Abstract: | We present detailed calculations for one- and two-photon above-threshold detachment (ATD) cross-sections of the negative positronium
ion Ps
-
(
e
+
e
-
e
-
), 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.
Received 24 January 2002 / Received in final form 9 April 2002 Published online 19 July 2002 |
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| Keywords: | PACS 32 80 Rm Multiphoton ionization and excitation to highly excited states (e g Rydberg states) – 32 80 -t Photon interactions with atoms – 36 10 Dr Positronium muonium muonic atoms and molecules |
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