Fresnel modeling of hematite crystal surfaces and application to martian hematite spherules

Details Fresnel modeling of hematite crystal surfaces and application to martian hematite spherules Fresnel modeling of hematite crystal surfaces and application to martian hematite spherules

Apr 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006icar..181..408g&link_type=abstract

Icarus, Volume 181, Issue 2, p. 408-418.

Physics

14

Scientific paper

The gray crystalline hematite at Meridiani Planum first discovered by the Mars Global Surveyor Thermal Emission Spectrometer (MGS-TES) instrument occurs as spherules that have been interpreted as concretions. Analysis of the TES and mini-TES spectra shows that no 390 cm-1 feature is present in the characteristic martian hematite spectrum. Here, we incorporate the mid-IR optical constants of hematite into a simple Fresnel reflectance model to understand the effect of emission angle and crystal morphology on the presence or absence of the 390 cm-1 feature in an IR hematite spectrum. Based on the results we offer two models for the internal structure of the martian hematite spherules.

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