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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 highest degree of Planetary Protection (PP) applies to landed planetary missions and sample return missions. To date, Dry Heat Microbial Reduction (DHMR) treatment is the only NASA approved PP technique for meeting the stringent sterility requirements for life detection missions and to prevent forward contamination. However, spacecraft (s/c) and payloads are made up of a diverse set of man-made...
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 progress in the development of the atmospheric electron X-ray spectrometer (AEXS) described. The AEXS is a surface analysis tool based on the excitation of characteristic X-ray and luminescence spectra at ambient pressure using an electron beam. In situ operation for the AEXS is obtained through the use of a thin electron transmissive membrane to isolate the vacuum of the electron source from...
We have determined that hexagonal single crystals of layer-structured germanium (II) iodide (GeI 2 ) up to 1.5 cm in diameter can be grown in a vapor reaction system. Specific initial conditions for optimum growth require the high temperature end of the reaction ampoule to be between 330 and 336°C in a neutral internal arson atmosphere of less than 10 -3 Torr. New powder X-ray...
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