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Direct evidence of a strong isomer effect in electron-impact double ionization of C3H4

S. W. J. Scully, V. Senthil, J. A. Wyer, M. B. Shah, E. C. Montenegro, M. Kimura, and H. Tawara
Phys. Rev. A 72, 030701(R) – Published 16 September 2005

Abstract

The electron-impact double ionization of two isomers of C3H4 (allene and propyne) between 25 and 1000 eV has been investigated using time-of-flight mass spectrometry. Unambiguous differences in the partial double-ionization spectra of these isomers are observed over the entire energy range. These isomer effects have been observed in C3H4 through the recording of target product channels and, in particular, when hard collisions involving the transfer of a large amount of energy is involved. Measurements of double-ionization events which fragment through Coulomb explosion are also reported. Coincidences between the charged fragment ions and protons were measured and shown to only exhibit isomer effects in the channel involving production of H++CH2+.

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  • Received 13 April 2005

DOI:https://doi.org/10.1103/PhysRevA.72.030701

©2005 American Physical Society

Authors & Affiliations

S. W. J. Scully, V. Senthil, J. A. Wyer, M. B. Shah, and E. C. Montenegro*

  • Department of Physics and Astronomy, Queen’s University Belfast, Belfast BT7 1NN, UK

M. Kimura

  • Department of Chemistry, Graduate School of Science, Kyushu University, Hakozaki, Fukuoka 812-8581, Japan

H. Tawara

  • Max Planck Institute of Nuclear Physics, Saupfercheckweg 1, D-69117 Heidelberg, Germany

  • *Current address: Instituto de Fisica, Universidade Federal do Rio de Janeiro, Rio de Janeiro, RJ, Brasil, Caixa Postal 68528, CEP 24941–972.

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Issue

Vol. 72, Iss. 3 — September 2005

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