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Studies of Dynamic Material Interfaces in Extreme Environments

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Technical Report,15 Sep 2015,14 Jun 2019

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University Of Chicago Chicago United States

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The scattering of atomic and molecular beams from well-characterized surfaces is an incisive method for studying thedynamics of gas-surface interactions, providing precise information on energy and momentum transfer as well as complexreaction mechanisms. Scanning probe measurements provide a powerful complement to scattering data as SPMmeasurements give a direct route to the visualization and spectroscopic characterization of interfacial atomic andnanosystems. This AFOSR program examined critical aspects of the chemical and physical behavior of dynamic materialinterfaces operating in extreme environments. Extreme conditions encompass high and low temperature regimes, highvelocity gas flows, optical and charged particle illumination, and severe oxidative environments where interfacialaerodynamic performance energy and momentum transfer characteristics, morphological change, and chemical stabilityneed to be assessed and quantified. This grant has led to a period of notable discovery and productivity, with experimentscomplemented by commensurate theory and numerical simulations.

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