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Polarized absorption spectra of single crystals of lunar pyroxenes and olivines.Measurements have been made of the polarized absorption spectra (360-2200 nm) of compositionally zoned pyroxene minerals in rocks 10045, 10047 and 10058 and olivines in rocks 10020 and 10022. The Apollo 11 pyroxenes with relatively high Ti/Fe ratios were chosen initially to investigate the presence of crystal field spectra of Fe(2+) and Ti(3+) ions in the minerals. Broad intense bands at about 1000 and 2100 nm arise from spin-allowed, polarization-dependent transitions in Fe(2+) ions in pyroxenes. Several weak sharp peaks occur in the visible region. Peaks at 402, 425, 505, 550, and 585 nm represent spin-forbidden transitions in Fe(2+) ions, while broader bands at 460-470 nm and 650-660 nm are attributed to Ti(3+) ions. Charge transfer bands, which in terrestrial pyroxenes often extend into the visible region, are displaced to shorter wavelengths in lunar pyroxenes. This feature correlates with the absence of Ti(3+) ions in these minerals.
Document ID
19720046844
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Burns, R. G.
Huggins, F. E.
Abu-Eid, R. M.
(MIT Cambridge, Mass., United States)
Date Acquired
August 6, 2013
Publication Date
April 1, 1972
Subject Category
Space Sciences
Accession Number
72A30510
Funding Number(s)
CONTRACT_GRANT: NGR-22-009-551
Distribution Limits
Public
Copyright
Other

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