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LDEF impact craters formed by carbon-rich impactorsTwo small craters (number 74, 119 microns, and number 31, 158 microns in diameter) with depth to diameter ratios of about 0.59 and 0.8, respectively, were found in Al from the Long Duration Exposure Facility (LDEF) experiment tray A11EOOF). Both craters have residues concentrated in the crater bottoms, along the walls, and on top of the overturned rims. Low voltage scanning electron electron microscopy, Auger electron spectroscopy, time of flight secondary ion mass spectroscopy and energy dispersive x-ray spectroscopy were used to obtain high resolution imagery and elemental analysis. Analyses indicate that the impactor for both craters was carbon-rich, as the residues contain mostly C. Silicon, S, and F in low concentrations are present on the Al surface away from the craters and may be, in part, contaminants.
Document ID
Document Type
Conference Paper
Bunch, T. E.
(NASA Ames Research Center Moffett Field, CA., United States)
Dibrozolo, F. Radicati
(Evans (Charles) and Associates Redwood City, CA., United States)
Fleming, Ronald H.
(Evans (Charles) and Associates Redwood City, CA., United States)
Harris, David W.
(Evans (Charles) and Associates Redwood City, CA., United States)
Brownlee, Don E.
(Washington Univ. Seattle., United States)
Reilly, Terrence W.
(Hitachi Scientific Instruments Mountain View, CA., United States)
Date Acquired
September 6, 2013
Publication Date
June 1, 1991
Publication Information
Publication: NASA, Langley Research Center, First LDEF Post-Retrieval Symposium Abstracts
Subject Category
Accession Number
Distribution Limits
Work of the US Gov. Public Use Permitted.

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