Hard-cube model analysis of gas-surface energy accommodation

Abstract

Two simple hard-cube models of gas-surface collisions are re-examined in light of recent argon–tungsten atomic beam scattering experiments. Both models provide a good description of the average energy exchange. The inclusion of a square well attraction to the hard-wall potential results in an accurate two parameter fit to the data. The derived well depth is in agreement with previous measurements of the heat of desorption.

The sticking probability of D2O-water on ice: Isotope effects and the influence of vibrational excitation

“…In contrary, the Baule formula predicts a decreasing isotope effect with larger incident angles because this model only considers momentum transfer normal to the surface. 17 On the other hand, the suggestion made by Batista et al that parallel momentum plays also a role in decreasing the water sticking cannot help to rationalize the increase in isotope effect observed here for large angles of incidence. 4 In their model, the sticking probability is related to the time available for steering of the incident molecule into a favorable orientation for adsorption.…”

Atom scattering from atomic surfactants: Collisions of argon with a dilute Bi:Ga solution

“…The change in ⌬E peak /E inc from 0.22 for Bi to 0.33 for Ga most likely arises from the greater momentum transfer from Ar ͑40 amu͒ to the light Ga atoms ͑70 amu͒ than to the more massive Bi atoms ͑209 amu͒. Within a single hard-sphere collision model, 9,10,12 these energy transfers correspond to the scattering of Ar from approximately one Bi atom and two Ga atoms, respectively, implying that energy transfer is determined primarily by atoms in the surface region of the alloy.…”

“…The shift and broadening of the P(E fin ) are characteristic of direct inelastic scattering, in which an Ar atom transfers a fraction of its incident energy to atoms in the liquid during one or a few collisions before recoiling away. [9][10][11] The shoulder at low E fin is attributed to argon atoms that undergo multiple, backward deflections and leave the surface with low translational energies. 12 The Bi and Ga energy distributions in Fig.…”

Energy dissipation and scattering angle distribution analysis of the classical trajectory calculations of methane scattering from a Ni(111) surface

“…This means that effectively the surface has a higher mass than assumed. 38 Second, there is no one-on-one interaction between surface atom and methane molecule, but multiple hydrogen atoms interacting with different Ni atoms. Third, the methane molecule is not rigid in contrast to assumption ͑1͒.…”