Vuv fluorescence of jet-cooled water as a vehicle for satellite thruster plume characterization.
Young, Justin W.
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https://hdl.handle.net/2142/91268
Description
Title
Vuv fluorescence of jet-cooled water as a vehicle for satellite thruster plume characterization.
Author(s)
Young, Justin W.
Contributor(s)
Stearns, Jaime A.
Issue Date
2016-06-22
Keyword(s)
Spectroscopy as an analytical tool
Abstract
A quantified characterization of a spacecraft’s thruster plume is obtainable through measurements of fluorescence from the plume. Fluorescence in a plume is due to electronic excitation of a plume’s molecular species, such as water and ammonia, from solar photons. For instance, electronic excitation of water with Lyman-alpha (121.6 nm) causes photodissociation to OH radical by following one of several possible pathways. One pathway leads to an electronically excited OH radical which fluoresces at ~310 nm. Here, the emission spectra of \chem{H_2O} excited at wavelengths ranging from ~128-121 nm are presented and the role of temperature in fluorescence is discussed.
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