Paper Title:
Investigation of Resonances in the Scattering of a Heavy ‘Positron’ by H2 that Involve Vibrationally Excited Quasi-Bound States
  Abstract

There is currently great interest in the very large values of the positron annihilation rate that have been observed in low-energy positron scattering by some molecules. The annihilation rate is proportional to , the effective number of electrons in the target available to the positron for annihilation. These very high rates and associated values of have been observed experimentally to occur at energies just below the energies of excited vibrational states of the molecule concerned. This has been explained by Gribakin [Phys. Rev. A Vol. 61 (2000), p. 022720] and Gribakin and Lee [Phys. Rev. Lett. Vol. 97 (2006), p. 193201] as being due to Feshbach resonances involving excited quasi-bound vibrational states. Their explanation is partly phenomenological. In this paper, I describe the results of an ab initio treatment of this resonant behaviour in the case of the scattering of a heavy ‘positron’ by , using the Kohn variational method.

  Info
Periodical
Edited by
Radosław Zaleski
Pages
25-30
DOI
10.4028/www.scientific.net/MSF.666.25
Citation
E. A.G. Armour, "Investigation of Resonances in the Scattering of a Heavy ‘Positron’ by H2 that Involve Vibrationally Excited Quasi-Bound States", Materials Science Forum, Vol. 666, pp. 25-30, 2011
Online since
December 2010
Export
Price
$32.00
Share

In order to see related information, you need to Login.

In order to see related information, you need to Login.

Authors: A.N. Ignatenko, Valentin Yu. Irkhin, A.A. Katanin
Abstract:The quantum Heisenberg antiferromagnet on the stacked triangular lattice with the intralayer nearest-neighbor exchange interaction J and...
257
Authors: A.V. Babushkin
Abstract:The high frequency intrinsic and effective permeability was calculated for spherical iron and barium particles in a nonmagnetic matrix (epoxy...
337
Authors: A.V. Rozhkov
Abstract:We research under what condition the mean-field approximation can be applied to study ordered phases of quasi-one-dimensional metal. It is...
591
Authors: Naoya Iwamoto, Shinobu Onoda, Takeshi Ohshima, Kazutoshi Kojima, Atsushi Koizumi, Kazuo Uchida, Shinji Nozaki
Abstract:The effect of electron irradiation on the charge collection efficiency of a 6H-SiC p+n diode has been studied. The diodes were irradiated...
921
Authors: Qiang Xian Huang, Qi Hou
Abstract:Based on dynamics theory, we have built several structures models close to the real cantilever of atomic force microscope. This paper deduces...
489