title: Gas-surface chemical reactions at high collision energies?
abstract: Most gas-surface chemical reactions occur via reaction of adsorbed species to form a thermal-energy ( approximately 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.
authors.affiliation: Department of Chemical Engineering, University of California Santa Barbara, California 93106-5080, USA.
authors.forename: Michael J
authors.initials: MJ
authors.lastname: Gordon
authors.forename: Xiangdong
authors.initials: X
authors.lastname: Qin
authors.forename: Alex
authors.initials: A
authors.lastname: Kutana
authors.forename: Konstantinos P
authors.initials: KP
authors.lastname: Giapis