NDLI: Atmospheric Electron Induced X-Ray Spectrometer (AEXS) Development

Content Provider	IEEE Xplore Digital Library
Author	Wilcox, J.Z. Urgiles, E. Toda, R. Crisp, J.
Copyright Year	2007
Description	Author affiliation: Jet Propulsion Lab., Pasadena (Wilcox, J.Z.; Urgiles, E.; Toda, R.; Crisp, J.)
Abstract	The progress in the development of the Atmospheric Electron X-ray Spectrometer (AEXS) is described. The AEXS is a surface analysis tool based on excitation of characteristic X-ray fluorescence (XRF) spectra from samples in ambient atmospheres using a focused electron beam. Operation in ambient atmospheres with moderate-to-high spatial resolution in comparison to similar instruments is obtained through the use of a thin electron transmissive membrane to isolate the vacuum of the electron probe, obviating the need for the samples to be drawn into the probe vacuum. Our initial setup consisted of an actively pumped chamber from within which the electrons were transmitted -not a portable instrument. The instrument that has been assembled and used to acquire XRF spectra in our laboratory during the past two years consists of a 20 keV electron tube sealed with a SiN membrane and requires no active pumping -a big step towards the development of a stand-alone instrument. The microprobe was used to perform elemental analysis of NIST and USGS standards, with good agreement with the certified composition for samples in up to about 90 Torr-cm thick atmosphere, and for resolving the composition of mm-sized mineral grains in inhomogeneous samples, a big improvement over the several cm-scale spatial resolution of the APXS instrument that flew on NASA's MER mission.
Starting Page	1
Ending Page	11
File Size	1401142
Page Count	11
File Format	PDF
ISBN	1424405246
ISSN	1095323X
DOI	10.1109/AERO.2007.352754
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2007-03-03
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Spectroscopy Instruments Atmosphere Spatial resolution Biomembranes Probes Fluorescence Electron beams Assembly Laboratories
Content Type	Text
Resource Type	Article
Subject	Aerospace Engineering Space and Planetary Science

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