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SIMS chemical analysis of extended impacts on the leading and trailing edges of LDEF experiment AO187-2Numerous 'extended impacts' found in both leading and trailing edge capture cells were successfully analyzed for the chemical composition of projectile residues by secondary ion mass spectrometry (SIMS). Most data were obtained from the trailing edge cells where 45 of 58 impacts were classified as 'probably natural' and the remainder as 'possibly man-made debris.' This is in striking contrast to leading edge cells where 9 of 11 impacts so far measured are definitely classified as orbital debris. Although all the leading edge cells had lost their plastic entrance foils during flight, the rate of foil failure was similar to that of the trailing edge cells, 10 percent of which were recovered intact. Ultraviolet embrittlement is suspected as the major cause of failure on both leading and trailing edges. The major impediment to the accurate determination of projectile chemistry is the fractionation of volatile and refractory elements in the hypervelocity impact and redeposition processes. This effect had been noted in a simulation experiment but is more pronounced in the LDEF capture cells, probably due to the higher average velocities of the space impacts. Surface contamination of the pure Ge surfaces with a substance rich in Si, but also containing Mg and Al, provides an additional problem for the accurate determination of impactor chemistry. The effect is variable, being much larger on surfaces that were exposed to space than in those cells that remained intact. Future work will concentrate on the analyses of more leading edge impacts and the development of new SIMS techniques for the measurement of elemental abundances in extended impacts.
Document ID
19930020178
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Amari, S.
(Washington Univ. Saint Louis, MO, United States)
Foote, J.
(Washington Univ. Saint Louis, MO, United States)
Swan, P.
(Washington Univ. Saint Louis, MO, United States)
Walker, R. M.
(Washington Univ. Saint Louis, MO, United States)
Zinner, E.
(Washington Univ. Saint Louis, MO, United States)
Lange, G.
(Max-Planck-Inst. fuer Kernphysik Heidelberg, Germany)
Date Acquired
September 6, 2013
Publication Date
April 1, 1993
Publication Information
Publication: NASA. Langley Research Center, LDEF: 69 Months in Space. Second Post-Retrieval Symposium, Part 2
Subject Category
Inorganic And Physical Chemistry
Accession Number
93N29367
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.
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