AVS 47th International Symposium
    Surface Science Wednesday Sessions
       Session SS3-WeM

Paper SS3-WeM8
Dynamics of Atom Abstraction in the Scattering of NH@sub 3@@super +@ on Deuterated Al(111)

Wednesday, October 4, 2000, 10:40 am, Room 210

Session: Gas/Surface Dynamics
Presenter: M. Maazouz, University of Notre Dame
Authors: M. Maazouz, University of Notre Dame
P.L. Maazouz, University of Notre Dame
D.C. Jacobs, University of Notre Dame
Correspondent: Click to Email
From a fundamental point of view, hyperthermal energy ion-surface reactions represent intriguing systems of study. The gas-surface collision energy is often high enough to drive reactions (e.g. dissociative scattering, activated chemisorption, sputtering, and atom abstraction) that are typically not observed in the thermal energy regime. Atom abstraction has been observed by many groups, yet the detailed dynamics of such hyperthermal energy reactions remain elusive. The experiment reported here examines the influence of translational energy and initial vibration quanta on the reaction of NH@sub 3@@super +@ with D/Al(111). The Al(111) surface was predosed with deuterium at 120 K, and the coverage was calibrated by TPD measurements. Resonance-enhanced mult iphoton ionization (REMPI) prepares incident ammonia ions in a specific vibration state. The ions are accelerated toward the deuterium-covered Al(111) surface at normal incidence, and the products are measured with mass-, angular-, and velocity-resolution. Specifically, the yield and kinetic energy distribution of NH@sub 3@D@super +@ is measured as a function of incident translational energy (5-80 eV) and vibration quanta (n=0-10) of NH@sub 3@@super +@.