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

Timothy D. Glotch; Philip Christensen; Thomas Sharp

doi:10.1016/j.icarus.2005.11.020

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

Timothy D. Glotch, Philip Christensen, Thomas Sharp

Research output: Contribution to journal › Article › peer-review

39 Scopus citations

Abstract

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.

Original language	English (US)
Pages (from-to)	408-418
Number of pages	11
Journal	Icarus
Volume	181
Issue number	2
DOIs	https://doi.org/10.1016/j.icarus.2005.11.020
State	Published - Apr 2006

Keywords

Infrared observations
Mars, surface
Mineralogy
Spectroscopy

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1016/j.icarus.2005.11.020

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title = "Fresnel modeling of hematite crystal surfaces and application to martian hematite spherules",

abstract = "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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T1 - Fresnel modeling of hematite crystal surfaces and application to martian hematite spherules

AU - Glotch, Timothy D.

AU - Christensen, Philip

AU - Sharp, Thomas

PY - 2006/4

Y1 - 2006/4

N2 - 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.

AB - 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.

KW - Infrared observations

KW - Mars, surface

KW - Mineralogy

KW - Spectroscopy

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JO - Icarus

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

Abstract

Keywords

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