Scattering of xenon from Ni(111): Collision-induced corrugation and energy transfer dynamics

Abstract

Articles you may be interested inCollision-induced annealing of octanethiol self-assembled monolayers by high-kinetic-energy xenon atoms Experiments have been conducted in which a beam of xenon atoms collides with a clean Ni͑111͒ surface, and the speed and angular distributions of the scattered Xe atoms are measured for different incident energies, incident angles, and surface temperatures. At high incident energies, the translational energy of the scattered Xe is independent of initial and final scattering angles. This result is attributed to multiple xenon-surface collisions prior to Xe escape. At lower incident energies, the scattering behavior depends more on the scattering angle. Interestingly, a small fraction of Xe is trapped on a 250 K Ni͑111͒ surface at high incident translational energies.

Molecular dynamics simulation of thermal accommodation coefficients for laser-induced incandescence sizing of nickel particles

“…On the other hand, it is very close to α = 0.1 observed for iron nanoclusters in argon by Eremin et al [16], and similar in magnitude to the results of other experimental studies [13,14] as summarized in Table 3. The Morse potential also predicts a much lower value for α t compared to α n , which is consistent with the MD simulations between monatomic gases and graphite [17] and in molecular beam scattering experiments involving hightemperature surfaces [44]. In this scattering regime, the high surface energy disallows a prolonged interaction between the gas molecule and the surface atoms, and since the nickel atoms primarily oscillate in a direction normal to the surface, most surface energy is accommodated into the normaltranslational mode of the argon atom.…”

N2Emission via Intermediate N2O in a Steady-State NO + CO + D2Reaction on Stepped Pd(211) by Angle-Resolved Desorption

“…Such measurements have already been popular in gas-phase reactions by means of angle-resolved (AR) resonance-enhanced multiphotons ionization (REMPI)–TOF analysis under velocity-selected crossed-molecular beams. On solid surfaces, AR-REMPI–TOF has been applied to photon (or electron)-stimulated desorption , or simple scatterings of inert molecules (or atoms). , However, no reports have been found for thermal reactive desorption probably because of the remarkably reduced product signals after angle-resolved procedures since desorbed species must be state-selectively ionized at points far from the surface . Such challenging measurements will encourage new analysis of surface desorption dynamics sensitive to structures of both reaction sites and active intermediates that yield hyperthermal products.…”

Trampoline motions in Xe–graphite(0001) surface scattering

“…The surface deformation leads to the dynamic corrugation in the gas-surface interaction potential [9][10]. Since the weak interlayer potential of graphite disperses the deformation over the wide range of a graphene sheet, Xe cannot penetrate deeply into the repulsive part of the gas-surface potential even if the Xe atom has hyperthermal incident energy; the Xe atom is scattered from the smooth surface of graphite even at hyperthemal incident energy.…”

“…Since the heavy inert gas atom has a large van der Waals radius, scattering in those systems involves the collision between an impinging atom and an ensemble of the surface atoms. The collision of an atom with the heavy mass and the large radius may lead to the effective dissipation of the kinetic energy through phonons [9,10].…”