Electron impact ionization of the SiD{sub {ital x}} ({ital x}=1{endash}3) free radicals
- Physics Department, City College of C.U.N.Y., New York (United States)
- Fachbereich Physik, Universitaet Greifswald (Germany)
We report measurements of absolute cross sections for the electron-impact ionization and dissociative ionization of the SiD{sub {ital x}} ({ital x}=1{endash}3) free radicals from threshold to 200 eV using the fast-neutral-beam technique. The deuterated rather than the protonated target species were used in order to allow a better separation of the various product ions from a given parent in our apparatus. A common feature of all three radicals studied in this work is a dominant parent ionization cross section with essentially the same absolute value of roughly 3.7{times}10{sup {minus}16} cm{sup 2} at 70 eV. Dissociative ionization processes for all three targets are less significant with a single dissociative process dominating in each case, viz. the removal of a single D atom (SiD{sub {ital x}}+{ital e}{sup {minus}}{r_arrow}SiD{sup +}{sub {ital x}{minus}1}+D+2{ital e}{sup {minus}}). The cross section for this dominant dissociative ionization channel also had the same maximum value of about 1.2{times}10{sup {minus}16} cm{sup 2} for all three targets. A comparison of the experimentally determined total single ionization cross sections with calculated cross sections using a modified additivity rule showed good to satisfactory agreement for all three targets in terms of the absolute values, but reveals some discrepancies in the cross section shapes. {copyright} {ital 1996 American Institute of Physics.}
- DOE Contract Number:
- FG02-94ER14476
- OSTI ID:
- 385646
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 15 Vol. 105; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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