Mars 2020 Team Using Australian Rocks in Search for Life on Mars

Brown, A. J.; Viviano, C. E.; Goudge, T. A.

doi:10.1029/2020eo146438

Cited by 1 publication

(1 citation statement)

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“…Importantly, Raman spectroscopy is capable of identifying a particular phase of forsterite by careful analysis of the peak centers of the olivine doublet [25] between 800 and 880 cm −1 . Likewise, characterization of other minerals yields valuable information as well, such as determination of the bulk composition of radioactive 26 Al by quantification of feldspar composition [26] and determination of the prevalence of aqueous environments and pH by quantification of evaporitic minerals such as carbonate [27,28] and sulfate [29,30] minerals.…”

Section: Raman Spectra Of Minerals Salts and Organics As Measuredmentioning

confidence: 99%

One‐mirror, one‐grating spatial heterodyne spectrometer for remote‐sensing Raman spectroscopy

Egan

Acosta-Maeda

Angel

et al. 2020

J Raman Spectroscopy

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Recently, we evaluated a new type of Fourier transform Raman spectrometer, the spatial heterodyne Raman spectrometer (SHRS), which provides high‐resolution Raman spectra without the need for an entrance slit. An SHRS is a variant of a Michelson interferometer in which the mirrors in the arms of a Michelson interferometer are replaced by two stationary diffraction gratings. Instead of sampling path length differences temporally, as in the case of a Michelson interferometer, SHRS samples path length differences spatially at a two‐dimensional array detector. Applying a Fourier transform to the resulting interferogram recovers the desired spectrum. In the modified SHRS (mSHRS) instrument used in the present work, one of the diffraction gratings has been replaced by a stationary λ/10 mirror. This modification has a few effects. First, the detector records a greater number of photons, as spectral light is not lost into unused diffraction orders in the mirror arm of mSHRS. Second, the free spectral range (wavelength coverage) is doubled, whereas the spectral resolution is cut in half. In this work, the authors present remote‐sensing Raman spectra of minerals, organics, and biomarkers using this mSHRS for the first time.

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