Dissociative recombination and dissociative excitation of {sup 4}HeH{sup +}: Absolute cross sections and mechanisms
- Department of Physics I, Royal Institute of Technology (KTH), S-100 44 Stockholm (Sweden)
Absolute cross sections have been determined for the dissociative recombination and dissociative excitation of {sup 4}HeH{sup +} for electron energies below 40 eV. The dissociative recombination cross section is in semiquantitative agreement with recent theoretical results by Sarpal, Tennyson, and Morgan [J. Phys. B {bold 27}, 5943 (1994)] and Guberman [Phys. Rev. A {bold 49}, R4277 (1994); in {ital XIXth} {ital International} {ital Conference} {ital on} {ital the} {ital Physics} {ital of} {ital Electronic} {ital and} {ital Atomic} {ital Collisions}, {ital Whistler}, {ital Canada}, AIP Conf. Proc. No. 360, edited by L. J. Dube, J. B. A. Mitchell, J. W. McConkey, and C. E. Brion (AIP, New York, 1995), p. 307]. The calculated resonant structure below a collision energy of 1 eV was not fully reproduced by the experiment. The quantum states of the dissociative recombination products at 0 eV collision energy have been determined; ground-state helium and excited hydrogen atoms ({ital n}=2) are dominantly formed, in agreement with recent predictions by Guberman. The dissociative excitation has an onset around 10 eV and follows the shape of the dissociative recombination cross section, illustrating that both processes start with the formation of doubly excited neutral states that lie in the ionization continuum as well as in the dissociation continuum. The dissociative excitation cross section is in quite good agreement with recent calculations by Orel and Kulander. {copyright} {ital 1996 The American Physical Society.}
- OSTI ID:
- 385691
- Journal Information:
- Physical Review A, Vol. 54, Issue 4; Other Information: PBD: Oct 1996
- Country of Publication:
- United States
- Language:
- English
Similar Records
Monte Carlo trajectory study of Ar+H/sub 2/ collisions. I. Potential energy surface and cross sections for dissociation, recombination, and inelastic scattering
Vibrational relaxation and dissociative recombination of H{sub 2}{sup +} induced by slow electrons