Issue 14, 2011

Kinetics and dynamics in physisorption of CH3Cl on HOPG: surface temperature and molecular orientation dependence

Abstract

We report a study of kinetics and dynamics in physisorption of CH3Cl on a highly-oriented pyrolytic graphite (HOPG). Thermal energy atom scattering (TEAS) was used to probe the kinetics of thermal CH3Cl adsorption on HOPG during the coverage evolution. The desorption energy of CH3Cl on HOPG changes from 0.25 to 0.30 eV with increasing surface coverage, suggesting the attractive interaction between CH3Cl molecules on the surface. On the other hand, the oriented molecular beam scattering was used to monitor the dynamical interaction of CH3Cl with HOPG at zero coverage, demonstrating that the CH3Cl scattering intensity depends on the molecular orientation of the incident CH3Cl. The observed steric preference is not sensitive to the surface temperature. These results suggest that the moderate anisotropy in the interaction potential induces the molecular-orientation dependence of energy dissipation during the transient trapping into the physisorption well.

Graphical abstract: Kinetics and dynamics in physisorption of CH3Cl on HOPG: surface temperature and molecular orientation dependence

Article information

Article type
Paper
Submitted
04 Oct 2010
Accepted
08 Feb 2011
First published
07 Mar 2011

Phys. Chem. Chem. Phys., 2011,13, 6584-6589

Kinetics and dynamics in physisorption of CH3Cl on HOPG: surface temperature and molecular orientation dependence

M. Hashinokuchi, T. Fukuyama, M. Okada and T. Kasai, Phys. Chem. Chem. Phys., 2011, 13, 6584 DOI: 10.1039/C0CP02014A

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