Bulletin of the American Physical Society
52nd Annual Meeting of the APS Division of Atomic, Molecular and Optical Physics
Volume 66, Number 6
Monday–Friday, May 31–June 4 2021; Virtual; Time Zone: Central Daylight Time, USA
Session M06: Ion-Neutral and Electron-Neutral Collisions
2:00 PM–3:36 PM,
Wednesday, June 2, 2021
Co-Sponsoring
Unit:
GEC
Chair: Mark Zammit, LANL
Abstract: M06.00007 : Semiclassical theory of laser-assisted dissociative recombination*
3:12 PM–3:24 PM
Live
Presenter:
Ilya I Fabrikant
(University of Nebraska - Lincoln)
Authors:
Ilya I Fabrikant
(University of Nebraska - Lincoln)
Harindranath B Ambalampitiya
(University of Nebraska - Lincoln)
Ioan Schneider
(Universite du Havre)
using a semiclassical approach. In the region outside a reaction sphere the electron motion in
the combined laser and Coulomb fields is treated classically. Within the sphere the laser-field
effects are neglected, and the recombination probability is derived from quantum-mechanical
cross sections calculated for the laser-free process. Specific calculations are performed for
dissociative recombination of H2+ in the field of the intensity 2.09 GW/cm2 and the wavelength
22.8 μm. In the energy region above 1 meV the cross section is significantly
enhanced, as compared to the field-free case, due to the Coulomb focusing effect [1,2]. The influence of
the indirect process due to electron capture into Rydberg states is also investigated. Although the Rydberg
resonances are washed out due to the field effects, they influence significantly the
magnitude of the dissociative recombination cross section.
[1] H. B Ambalampitiya and I. I. Fabrikant, Phys. Rev. A 99, 063404 (2019).
[2] I. I. Fabrikant and H. B Ambalampitiya, Phys. Rev. A 101, 053401 (2020).
*Supported by the National Science Foundation
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