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

Published

January 1, 2003

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(}u3}P) atoms. The survival probability of O(^{1_{) is determined to be 0.01, and the probability for O(}u1_{) quenching to super-elastic O(}u3}P) 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} u3}P 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

Pub Type

Journals

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: ^1_andu3P State-Resolved Energy Transfer Dynamics, Journal of Chemical Physics (Accessed November 23, 2024)