Kinetic energy distribution of OH+ from water fragmentation by electron impact

Natalia Ferreira, L. Sigaud, and E. C. Montenegro
Phys. Rev. A 96, 012705 – Published 18 July 2017

Abstract

The release of the highly reactive radical OH+ from the fragmentation of water by electron impact is made mostly through the OH++H0 channel. This channel ejects suprathermal OH+ ions with a kinetic energy distribution whose details are unexplored so far due to the difficulty in experimentally characterizing ions ejected with very low kinetic energy without another charged partner. These ions are studied here using the delayed extraction time-of-flight technique (DETOF). The structures and substructures in the kinetic energy distribution of OH+ associated with both single and double ionization are identified qualitatively and quantitatively. A comparison with the kinetic energy distribution of the complementary channel OH0+H+, also originating from vacancies in the 1b2 orbital, shows marked differences between the two, mainly regarding the relative role between the fragmentation involving the H2O+ ground state or via transitions to repulsive states.

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  • Received 11 May 2017

DOI:https://doi.org/10.1103/PhysRevA.96.012705

©2017 American Physical Society

Physics Subject Headings (PhySH)

Atomic, Molecular & Optical

Authors & Affiliations

Natalia Ferreira*

  • CEFET-RJ, 20271-110 Rio de Janeiro, Rio de Janeiro, Brazil

L. Sigaud

  • Universidade Federal Fluminense, 24210-346 Niteroi, Rio de Janeiro, Brazil

E. C. Montenegro

  • Universidade Federal do Rio de Janeiro (UFRJ), 21941-972 Rio de Janeiro, Rio de Janeiro, Brazil

  • *nataferr@gmail.com
  • lsigaud@if.uff.br
  • montenegro@if.ufrj.br

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Issue

Vol. 96, Iss. 1 — July 2017

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