Triple differential cross-section for the ionization of H- at low energies

R. K. Chauhan; M. K. Srivastava; R. Srivastava

doi:10.1140/epjd/e2005-00080-2

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Atomic, Molecular, Optical and Plasma Physics

Eur. Phys. J. D 35, 499-503 (2005)
https://doi.org/10.1140/epjd/e2005-00080-2

Triple differential cross-section for the ionization of H^- at low energies

R. K. Chauhan¹^a, M. K. Srivastava²^b and R. Srivastava¹^c

¹ Department of Physics, Indian Institute of Technology, Roorkee-247 667, India
² Institute Instrumentation Centre, Indian Institute of Technology, Roorkee-247 667, India

Corresponding authors: ^a rajkrdph@iitr.ernet.in - ^b mksrific@iitr.ernet.in - ^c rajsrfph@iitr.ernet.in

Received: 26 February 2005
Revised: 5 April 2005
Published online: 7 June 2005

Abstract

The triple differential cross-sections (TDCS) for the ionization of H^- at excess energies of 8, 10 and 12 eV are calculated using distorted-wave Born approximation in the equal energy sharing and $\theta _{ab}=180^\circ$ kinematics. The final state electron-electron correlation is included through effective charges and exchange distortion in semi-classical local approximation. The spin state of the exchanging electrons is taken care of. The angular distribution of the TDCS is very different from the case of helium and is found to show peaks at $\theta _{a}\approx 30^\circ$ and $150^\circ$ . The capture process is found to contribute quite significantly around $\theta_{a} = 90^\circ$ and is supported by the PCI.