Further characterization of spectral features attributable to titanium on the moonThe following transitions are observed in the electronic absorption spectra of lunar titanaugites: Fe(2+) spin-allowed and spin-forbidden crystal field; Ti(3+) spin allowed and Jahn-Teller split crystal field; Ti(3+)-Ti(4+) CT; Fe(2+)-Ti(4+) CT; and O(2-)-Fe(2+), Ti(3+), Ti(4+) CT. Of these, the transitions involving Ti(3+) are unique to lunar or nonferric-bearing titanaugites. All titanaugites have the Fe(2+) crystal field and Fe(2+)-Ti(4+) CT transitions in common. These features in the diffuse reflectance spectra of lunar materials give rise to the '1.0 band' and to the observed absorption around 0.5-0.6 micron, respectively. Since regolith contains a variety of phases with coexisting Fe(2+), Ti(3+), and Ti(4+) ions, several metal-metal charge transfer processes are possible.
Document ID
19770051941
Acquisition Source
Legacy CDMS
Document Type
Conference Proceedings
Authors
Burns, R. G. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Parkin, K. M. (Massachusetts Inst. of Tech. Cambridge, MA, United States)
Loeffler, B. M. (MIT Cambridge, Mass., United States)
Leung, I. S. (Herbert H. Lehman College Bronx, N.Y., United States)