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Title: Atmospheric electron-induced X-Rray spectrometer (AEXS) development
Authors: Wilcox, Jaroslava Z.
Urgiles, Eduardo
Toda, Risaku
George, Thomas
Douglas, Susanne
Crisp, Joy
Keywords: X-ray fluorescence (XRF)
Issue Date: 25-Apr-2005
Publisher: Pasadena, CA : Jet Propulsion Laboratory, National Aeronautics and Space Administration, 2005
Citation: European Geosciences Union General Assembly, Vienna, Austria, April 24-29, 2005
Abstract: This paper describes the progress in the development of the so-called Atmospheric Electron X-ray Spectrometer (AEXS) instrument in our laboratory at JPL. The AEXS is a novel miniature instrument concept based on the excitation of characteristic X-Ray Fluorescence (XRF) and luminescence spectra using a focused electron beam, for non-destructive evaluation of surfaces of samples in situ, in planetary ambient atmosphere. In situ operation is obtained through the use of a thin electron transmissive membrane to isolate the vacuum within the AEXS electron source from the outside ambient atmosphere. By using a focused electron beam, the impinging electrons on samples in the external atmosphere excite XRF spectra from the irradiated spots with high-to-medium spatial resolution. The XRF spectra are analyzed using an energy-dispersive detector to determine suface elemental composition. The use of high- intensity electron beam results in rapid spectrum acquisition (several minutes), and consequently low energy consumption (several tens of Joules) per acquired XRF spectrum in comparison to similar portable instruments.
Appears in Collections:JPL TRS 1992+

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