Multidimensional dynamics in surface reactions

Xiao-Yang Zhu

doi:10.1117/12.307142

30 April 1998 Multidimensional dynamics in surface reactions

Xiao-Yang Zhu

Proceedings Volume 3272, Laser Techniques for Surface Science III; (1998) https://doi.org/10.1117/12.307142
Event: Optoelectronics and High-Power Lasers and Applications, 1998, San Jose, CA, United States

Abstract

The conceptual starting point in surface dynamics is the potential energy surface, the most celebrated of which is the one proposed by Lennard-Jones 65 years ago. The Lennard- Jones potential considers two adsorption states as a molecule approaches the surface: a molecular precursor state and a chemisorption state. While this simple model has contributed much to the development of surface reaction dynamics, its one-dimensionality is of significant limitation. Molecule-surface interactions are inherently multidimensional. For example, molecular internal motions, substrate motions, and the relative orientations of a molecule to surface atoms are all important in determining the chemical consequence of a surface process. These issues are illustrated using recent examples involving polyatomic species. In the first example, electronic excitation/de-excitation of adsorbed NH₃ results in internal vibrational excitation, which can couple efficiently to the adsorbate-surface coordinate and results in desorption. In the second example, the thermal desorption of CH₃ from GaAs can lead to vibrational excitation in the product. The third example shows that a substantial amount of energy released by adsorbate-surface bond formation can be transferred to the intramolecular modes, leading to the ejection of energetic products.

Citation Download Citation

Xiao-Yang Zhu "Multidimensional dynamics in surface reactions", Proc. SPIE 3272, Laser Techniques for Surface Science III, (30 April 1998); https://doi.org/10.1117/12.307142

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