Impact of UV radiation on the Raman and infrared spectral signatures of sulfates, phosphates and carbonates: Implications for Mars exploration

Royer, C.; Bernard, S.; Beyssac, O.; Balan, E.; Forni, O.; Gauthier, M.; Morand, M.; Garino, Y.; Rosier, P.

doi:10.1016/j.icarus.2023.115894

Cited by 2 publications

(7 citation statements)

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“…The spectrum of the lamp is similar to the solar light received on the Martian surface (details in Method section). With a SuperCam-like Raman system 35,38,39 , we acquired Raman spectra in situ in the chamber at different times over an ~ 24 h-long continuous irradiation period.…”

Section: Laboratory Irradiation Experimentsmentioning

confidence: 99%

“…A number of studies have investigated radiation from radioactive minerals in close proximity [57][58][59][60][61][62] . It has been shown that irradiating minerals can result in a decreased contribution of the Raman signal to the total signal, and this observation is explained by the creation of color centers and/or electronic defects in the sample 35 . It is proposed that the increased background could reflect luminescence from these defects.…”

Section: Radiation-induced Aging On Mars?mentioning

confidence: 99%

“…The durations of exposure monitored on Mars (almost 1000 sols) and in the laboratory (1270 min) are very different, making it difficult to compare the kinetics of the observed process. Considering that the spectrum of UV-irradiation in the laboratory is representative of that of solar irradiation on the surface of Mars 35 but that illumination in the laboratory was constant and continuous for the whole length of the experiment without shadowing or a day-night cycle, as experienced by the target at the surface of Mars, we estimate that the dose received by the sample in the laboratory is consistent with the dose received by the SCCT on Mars over a few days to one week 35 . Note that the impact of a continuous irradiation of the target compared to the interrupted irradiation related to the day-night cycle on Mars has not been documented; this topic should be studied in the future.…”

Section: Radiation-induced Aging On Mars?mentioning

confidence: 99%

“…This study only looked into the influence of UV irradiation on an apatite mineral. Laboratory experiments performed by Royer et al showed that Raman signatures of different phosphates, sulfates and carbonates also change with the duration of Mars-like UV irradiation 35 . It is therefore likely that other minerals are similarly affected by UV radiation on the Martian surface as the apatite.…”

Section: Radiation-induced Aging On Mars?mentioning

confidence: 99%

“…The SuperCam-like remote Raman test bed used for this study has been described in several previous studies 38,39 , and the test protocol used in this study is similar to that described in Royer et al 35 . The main characteristics of the setup are summarized here.…”

Section: Laboratory Tests and Datamentioning

confidence: 99%

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Radiation-induced alteration of apatite on the surface of Mars: first in situ observations with SuperCam Raman onboard Perseverance

Clavé,

Beyssac,

Bernard

et al. 2024

Sci Rep

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Planetary exploration relies considerably on mineral characterization to advance our understanding of the solar system, the planets and their evolution. Thus, we must understand past and present processes that can alter materials exposed on the surface, affecting space mission data. Here, we analyze the first dataset monitoring the evolution of a known mineral target in situ on the Martian surface, brought there as a SuperCam calibration target onboard the Perseverance rover. We used Raman spectroscopy to monitor the crystalline state of a synthetic apatite sample over the first 950 Martian days (sols) of the Mars2020 mission. We note significant variations in the Raman spectra acquired on this target, specifically a decrease in the relative contribution of the Raman signal to the total signal. These observations are consistent with the results of a UV-irradiation test performed in the laboratory under conditions mimicking ambient Martian conditions. We conclude that the observed evolution reflects an alteration of the material, specifically the creation of electronic defects, due to its exposure to the Martian environment and, in particular, UV irradiation. This ongoing process of alteration of the Martian surface needs to be taken into account for mineralogical space mission data analysis.

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Section: Laboratory Irradiation Experimentsmentioning

confidence: 99%