Understanding the climate of Mars requires a detailed understanding of the optical properties of Martian dust as it is a ubiquitous component of the atmosphere. The need for a consensus motivates measurements of terrestrial simulants under controlled conditions. We demonstrate an in-situ method to entrain and directly measure the absorption spectrum of six Martian dust simulants using photoacoustic spectroscopy. Measured absorption cross-sections (Cabs) were used in Mie theory calculations to retrieve the imaginary component of the refractive index (k) of each sample while constraining the real component to n = 1.5; the refractive index of silica. The weakly absorbing simulants have k values ranging between 0.002 and 0.03 at λ = 500 nm.
and Zangmeister, C.
Absorption Spectra of Martian Dust Simulants, ACS Earth and Space Chemistry, [online], https://doi.org/10.1021/acsearthspacechem.1c00335, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=932686
(Accessed December 9, 2023)