Direct evidence of a strong isomer effect in electron-impact double ionization of C{sub 3}H{sub 4}
- Department of Physics and Astronomy, Queen's University Belfast, Belfast BT7 1NN (United Kingdom)
The electron-impact double ionization of two isomers of C{sub 3}H{sub 4} (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 C{sub 3}H{sub 4} 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{sup +}+CH{sub 2}{sup +}.
- OSTI ID:
- 20718461
- Journal Information:
- Physical Review. A, Vol. 72, Issue 3; Other Information: DOI: 10.1103/PhysRevA.72.030701; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1050-2947
- Country of Publication:
- United States
- Language:
- English
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