Reassignment of the iron (3) absorption bands in the spectra of Mars

Details Reassignment of the iron (3) absorption bands in the spectra of Mars Reassignment of the iron (3) absorption bands in the spectra of Mars

Apr 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985pggp.rept..395s&link_type=abstract

In NASA, Washington Repts. of Planetary Geol. and Geophys. Program, 1984 p 395-396 (SEE N85-23474 13-91)

Astronomy and Astrophysics

Astronomy

Absorption Spectra, Infrared Spectra, Iron, Mars Surface, Planetary Composition, Spectral Bands, Astronomical Spectroscopy, Iron Oxides, Ligands, Minerals, Molecular Orbitals

Scientific paper

Absorption features in the near-infrared and visible region reflectance spectra of Mars have been assigned to specific Fe (3+) crystal-field and o(2-) yields Fe(3+) charge transfer transitions. Recently, near-ultraviolet absorption spectra of iron oxides were obtained and the energies of o(2-) yields Fe(3+) charge-transfer (LMCT) transitions were determined from accurate SCF-X # alpha-SW molecular orbital calculations on (FeO6)(9-) and (FeO4)(5-) clusters. Both the theoretical and experimental results, together with existing data in the literature, show that some of the previous Fe(3+) band assignments in the spectra of Mars need to be revised. The theory of Fe(3+) spectra in minerals is discussed and applied to the spectrum of Mars.

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