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Oxygen Atom Interactions with Fused Silica Surfaces: 1 and u3P State-Resolved Energy Transfer Dynamics

Published

Author(s)

Steven A. Buntin, Maritoni A. Litorja

Abstract

A laser-based O atom beam source together with state-resolved detection techniques are used to characterize the energy transfer dynamics of ground (3PJ) and electronically-excited (1) state O atoms interacting with a fused silica surface. Time-of-flight spectra of the incident beam and scattered O atoms are measured, and provide detailed information regarding state-resolved angular and velocity distributions. We find a significant degree of thermalization (angular, fine structure state and velocity distributions) in the scattered O(u3P) atoms. The survival probability of O(1) is determined to be 0.01, and the probability for O(u1) quenching to super-elastic O(u3P) is 0.05. Given that the measured probability for radiative quenching of 1 is not significant ( 0.001), these results indicate that the majority of the available energy in the incident O atoms (both u3P and 1D) is transferred to the substrate. The implications of the scattering/energy transfer dynamics with respect to the O atom/fused silica surface interactions are discussed.
Citation
Journal of Chemical Physics
Volume
118
Issue
No. 1

Keywords

atomic oxygen, electronic state quenching, fused silica, gas-surface scattering, O atom Surface reaction, REMPI, state-resolved dynamics

Citation

Buntin, S. and Litorja, M. (2003), Oxygen Atom Interactions with Fused Silica Surfaces: <sup>1<sub> and </sub>u3</sup>P State-Resolved Energy Transfer Dynamics, Journal of Chemical Physics (Accessed April 15, 2024)
Created January 1, 2003, Updated February 19, 2017