skip to main content

SciTech ConnectSciTech Connect

Title: A guided-ion beam study of the collisions and reactions of I{sup +} and I{sub 2}{sup +} with I{sub 2}

Growing interest in developing and testing iodine Hall effect thrusters requires measurements of the cross sections of reactions that generate low energy plasma following discharge. Limited experimental and theoretical work necessitates a decisive experiment to elucidate the charge exchange and collision-induced dissociation channels. To this end, we have used guided-ion beam techniques to measure cross sections for both I{sup +} + I{sub 2} and I{sub 2}{sup +}+I{sub 2} collisions. We present total collision cross sections as well as collision-induced dissociation cross sections for center-of-mass collision energies ranging from 0.5 to 200 eV for molecular iodine cations. Similarly, we present total collision cross section and charge-exchange cross sections for atomic iodine cations for center-of-mass collision energies ranging from 0.67 to 167 eV. Time-of-flight measurements of the collision products allow determination of velocity distributions, which show evidence of complex formation of I{sub 3}{sup +} from the I{sup +} + I{sub 2} reaction at collision energies below 6 eV.
Authors:
 [1] ; ;  [2]
  1. Institute for Scientific Research, Boston College, Chestnut Hill, Massachusetts 02159 (United States)
  2. Air Force Research Laboratory, Space Vehicles Directorate, Kirtland AFB, Albuquerque, New Mexico 87117 (United States)
Publication Date:
OSTI Identifier:
22416143
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Chemical Physics; Journal Volume: 142; Journal Issue: 7; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
74 ATOMIC AND MOLECULAR PHYSICS; CATIONS; CHARGE EXCHANGE; CROSS SECTIONS; DISSOCIATION; EV RANGE; HALL EFFECT; IODINE; IODINE IONS; ION BEAMS; ION-MOLECULE COLLISIONS; MASS; MOLECULAR IONS; PLASMA; TESTING; THRUSTERS; TIME-OF-FLIGHT METHOD; VELOCITY