Formation of anions and cations via a binary-encounter process in OH+ + Ar collisions

The role of dissociative excitation and statistical aspects

E. Lattouf, Z. Juhász, J. Y. Chesnel, S. T S Kovács, E. Bene, P. Herczku, B. A. Huber, A. Méry, J. C. Poully, J. Rangama, B. Sulik

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

Molecular fragmentation leading to the formation of negatively and positively charged hydrogen ions in 7-keV OH+ + Ar collisions is investigated experimentally. The most striking finding is that negative and positive hydrogen ions are emitted with very similar angular dependences. Also, the kinetic energy distribution of the H+ fragment shows strong similarities with that of the ejected H- ion. The kinematics of the emitted H core is found to be essentially driven by its scattering on the atomic target. However, in addition to this binary-encounter process, dissociative electronic excitation of the molecular projectile has to be invoked to explain the observed fragmentation patterns. Though the electron capture process is complex, it is shown that the relative population of the different final charge states of the outgoing fragments can be described by simple statistical laws.

Original languageEnglish
Article number062721
JournalPhysical Review A
Volume89
Issue number6
DOIs
Publication statusPublished - Jun 30 2014

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hydrogen ions
encounters
fragmentation
fragments
anions
cations
collisions
positive ions
electron capture
excitation
projectiles
energy distribution
kinematics
kinetic energy
scattering
electronics
ions

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Formation of anions and cations via a binary-encounter process in OH+ + Ar collisions : The role of dissociative excitation and statistical aspects. / Lattouf, E.; Juhász, Z.; Chesnel, J. Y.; Kovács, S. T S; Bene, E.; Herczku, P.; Huber, B. A.; Méry, A.; Poully, J. C.; Rangama, J.; Sulik, B.

In: Physical Review A, Vol. 89, No. 6, 062721, 30.06.2014.

Research output: Contribution to journalArticle

Lattouf, E. ; Juhász, Z. ; Chesnel, J. Y. ; Kovács, S. T S ; Bene, E. ; Herczku, P. ; Huber, B. A. ; Méry, A. ; Poully, J. C. ; Rangama, J. ; Sulik, B. / Formation of anions and cations via a binary-encounter process in OH+ + Ar collisions : The role of dissociative excitation and statistical aspects. In: Physical Review A. 2014 ; Vol. 89, No. 6.
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