Depth-sensitive analysis of fluorine on lunar sample surfaces and in carbonaceous chondrites by a nuclear resonant reaction technique

[摘要] The nuclear resonant reaction ¹⁹F(ρ,αγ)¹⁶O has been used toperform depth-sensitive analyses of fluorine in lunar samples andcarbonaceous chondrites. The resonance at 0.83 MeV (center-of-mass)in this reaction is utilized to study fluorine surface films, withparticular interest paid to the outer micron of Apollo 15 green glass,Apollo 17 orange glass, and lunar vesicular basalts. These resultsare distinguished from terrestrial contamination, and are discussedin terms of a volcanic origin for the samples of interest. Measurementsof fluorine in carbonaceous chondrites are used to better definethe solar system fluorine abundance. A technique for measurement ofcarbon on solid surfaces with applications to direct quantitativeanalysis of implanted solar wind carbon in lunar samples is described.

[发布机构] University:California Institute of Technology;Department:Physics, Mathematics and Astronomy

[关键词] Physics