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Gas−Surface Chemical Reactions at High Collision Energies?

Gordon, Michael J. and Qin, Xiangdong and Kutana, Alex and Giapis, Konstantinos P. (2009) Gas−Surface Chemical Reactions at High Collision Energies? Journal of the American Chemical Society, 131 (5). pp. 1927-1930. ISSN 0002-7863.

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Most gas−surface chemical reactions occur via reaction of adsorbed species to form a thermal-energy (kT) product; however, some instances exist where an energetic projectile directly reacts with an adsorbate in a single-collision event to form a hyperthermal product (with a kinetic energy of a few eV). Here we show for the first time that 30−300 eV F^+ bombardment of fluorinated Ag and Si surfaces produces “ultrafast” F_2^− products with exit energies of up to 90 eV via a multistep direct-reaction mechanism. Experiments conclusively show that the projectile F atom ends up in the fast molecular product despite the fact that the impact energy is far greater than typical bond energies.

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Giapis, Konstantinos P.0000-0002-7393-298X
Additional Information:© 2009 American Chemical Society. Received October 3, 2008. Publication Date (Web): January 20, 2009. This study was based on work supported by the National Science Foundation under Grant CTS-0613981. Applied Materials, Inc. donated equipment essential for the experiments. Supporting Information: Details of MD and DFT calculations. This material is available free of charge via the Internet at
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Issue or Number:5
Record Number:CaltechAUTHORS:20090825-083650628
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:15290
Deposited By: George Porter
Deposited On:09 Sep 2009 22:55
Last Modified:03 Oct 2019 00:56

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