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Title: Anion yields produced by low-energy electron impact on condensed hydrocarbon films

Abstract

Low-energy (0-20 eV) electron impact on thin condensed hydrocarbon films is observed to produce, via dissociative attachment and dipolar dissociation, significant yields of H{sup {minus}} and much lower yields of CH{sub n}{sup {minus}} (n = 1-3) fragment anions. These yields have been measured as a function of incident electron energy and film thickness for the saturated n-C{sub n}H{sub 2n+2} (n = 2, 4-9) and for the unsaturated 1-C{sub n}H{sub 2n} (n = 2-4) hydrocarbons. Each type of anion desorbing from the saturated hydrocarbon films exhibits a single dissociative attachment resonance at approximately 10 eV, the energy of which is found to vary only slightly with hydrocarbon chain length, in contrast with the trends observed in the gas phase for H{sup {minus}} formation from these systems. The hydrogen anion yields produced from the unsaturated species are similar to those from the saturated species, while the larger fragment anions typically demonstrate asymmetric or bimodal yield distributions. The thickness dependence of the anion yields suggests that the observed H{sup {minus}} anions are formed in the uppermost 3-5 layers of the film, while the larger desorbing anion fragments arise from the first 1-2 layers.

Authors:
; ;  [1]
  1. Univ. de Sherbrooke, Quebec (Canada)
Publication Date:
OSTI Identifier:
5973319
Resource Type:
Journal Article
Journal Name:
Journal of Physical Chemistry; (United States)
Additional Journal Information:
Journal Volume: 95:12; Journal ID: ISSN 0022-3654
Country of Publication:
United States
Language:
English
Subject:
38 RADIATION CHEMISTRY, RADIOCHEMISTRY, AND NUCLEAR CHEMISTRY; HYDROCARBONS; CHEMICAL RADIATION EFFECTS; ANIONS; DECOMPOSITION; DESORPTION; ELECTRON BEAM TARGETS; ELECTRON BEAMS; EV RANGE 01-10; EV RANGE 10-100; EXPERIMENTAL DATA; FILMS; MASS SPECTROSCOPY; SURFACES; BEAMS; CHARGED PARTICLES; CHEMICAL REACTIONS; DATA; ENERGY RANGE; EV RANGE; INFORMATION; IONS; LEPTON BEAMS; NUMERICAL DATA; ORGANIC COMPOUNDS; PARTICLE BEAMS; RADIATION EFFECTS; SPECTROSCOPY; TARGETS; 400600* - Radiation Chemistry

Citation Formats

Rowntree, P, Parenteau, L, and Sanche, L. Anion yields produced by low-energy electron impact on condensed hydrocarbon films. United States: N. p., 1991. Web. doi:10.1021/j100165a054.
Rowntree, P, Parenteau, L, & Sanche, L. Anion yields produced by low-energy electron impact on condensed hydrocarbon films. United States. https://doi.org/10.1021/j100165a054
Rowntree, P, Parenteau, L, and Sanche, L. 1991. "Anion yields produced by low-energy electron impact on condensed hydrocarbon films". United States. https://doi.org/10.1021/j100165a054.
@article{osti_5973319,
title = {Anion yields produced by low-energy electron impact on condensed hydrocarbon films},
author = {Rowntree, P and Parenteau, L and Sanche, L},
abstractNote = {Low-energy (0-20 eV) electron impact on thin condensed hydrocarbon films is observed to produce, via dissociative attachment and dipolar dissociation, significant yields of H{sup {minus}} and much lower yields of CH{sub n}{sup {minus}} (n = 1-3) fragment anions. These yields have been measured as a function of incident electron energy and film thickness for the saturated n-C{sub n}H{sub 2n+2} (n = 2, 4-9) and for the unsaturated 1-C{sub n}H{sub 2n} (n = 2-4) hydrocarbons. Each type of anion desorbing from the saturated hydrocarbon films exhibits a single dissociative attachment resonance at approximately 10 eV, the energy of which is found to vary only slightly with hydrocarbon chain length, in contrast with the trends observed in the gas phase for H{sup {minus}} formation from these systems. The hydrogen anion yields produced from the unsaturated species are similar to those from the saturated species, while the larger fragment anions typically demonstrate asymmetric or bimodal yield distributions. The thickness dependence of the anion yields suggests that the observed H{sup {minus}} anions are formed in the uppermost 3-5 layers of the film, while the larger desorbing anion fragments arise from the first 1-2 layers.},
doi = {10.1021/j100165a054},
url = {https://www.osti.gov/biblio/5973319}, journal = {Journal of Physical Chemistry; (United States)},
issn = {0022-3654},
number = ,
volume = 95:12,
place = {United States},
year = {Thu Jun 13 00:00:00 EDT 1991},
month = {Thu Jun 13 00:00:00 EDT 1991}
}