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http://hdl.handle.net/2014/40433
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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. |
| URI: | http://hdl.handle.net/2014/40433 |
| Appears in Collections: | JPL TRS 1992+
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