Space weathering of silicate regoliths with various FeO contents: New insights from laser irradiation experiments and theoretical spectral simulations

Moroz, L. V.; Starukhina, L. V.; Rout, S. S.; Sasaki, Sho; Helbert, J.; Baither, D.; Bischoff, A.; Hiesinger, H.

doi:10.1016/j.icarus.2014.03.021

Cited by 29 publications

(19 citation statements)

References 83 publications

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“…It is interesting to note that the different weathering rates for our two olivine samples are also consistent with recent laboratory studies (Moroz et al. ) on the laser irradiation of natural plagioclase (An 47‐52 ), which contained an intermediate Fe concentration (0.72 wt% FeO). In those experiments, one laser pulse caused the spectral slope to increase two times more than it increased after a single shot in our Fo 99+ sample and about two times less than it increased after a single shot in our Fo 90 sample.…”

Section: Discussionsupporting

confidence: 90%

“…A similar conclusion was made by Moroz et al. (), who observed brightening in plagioclase pellets that had been laser irradiated. We point out that brightening has also been reported for dark minerals that have been ion irradiated, although the process may be different (Vernazza et al.…”

Section: Discussionsupporting

confidence: 86%

“…FE‐STEM bright‐field (BF) imaging shows that the altered layer is similar in thickness to what has been observed in laser‐irradiated plagioclase grains (Moroz et al. ). Specifically the altered layer is thickest (0.8–1.0 μm) on the side of the grain that slopes down into the depression, then progressively tapers to a thickness of <0.5 μm over the top or “crest” of the grain away from depression.…”

Section: Resultssupporting

confidence: 56%

“…Whether it would be accelerated for compositions more Fe‐rich than Fo 90 cannot be determined based on our experiments, but has been discussed by Moroz et al. ().…”

Section: Discussionmentioning

confidence: 72%

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Space weathering of silicates simulated by successive laser irradiation: In situ reflectance measurements of Fo₉₀, Fo₉₉₊, and SiO₂

Loeffler

Dukes

Christoffersen

et al. 2016

Meteorit & Planetary Scien

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Pulsed-laser irradiation causes the visible-near-infrared spectral slope of olivine (Fo 90 and Fo 99+ ) and SiO 2 to increase (redden), while the olivine samples darken and the SiO 2 samples brighten slightly. XPS analysis shows that irradiation of Fo 90 produces metallic Fe. Analytical SEM and TEM measurements confirm that reddening in the Fo 90 olivine samples correlates with the production of "nanophase" metallic Fe (npFe 0 ) grains, 20-50 nm in size. The reddening observed in the SiO 2 sample is consistent with the formation of SiO or other SiO x species that absorb in the visible. The weak spectral brightening induced by laser irradiation of SiO 2 is consistent with a change in surface topography of the sample. The darkening observed in the olivine samples is likely caused by the formation of larger npFe 0 particles, such as the 100-400 nm diameter npFe 0 identified during our TEM analysis of Fo 90 samples. The Fo 90 reflectance spectra are qualitatively similar to those in previous experiments suggesting that in all cases formation of npFe 0 is causing the spectral alteration. Finally, we find that the accumulation of successive laser pulses cause continued sample darkening in the Vis-NIR, which suggests that repeated surface impacts are an efficient way to darken airless body surfaces.

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Section: Discussionsupporting

confidence: 90%

Section: Discussionsupporting

confidence: 86%

Section: Resultssupporting

confidence: 56%

“…Whether it would be accelerated for compositions more Fe‐rich than Fo 90 cannot be determined based on our experiments, but has been discussed by Moroz et al. ().…”

Section: Discussionmentioning

confidence: 72%

See 2 more Smart Citations

Space weathering of silicates simulated by successive laser irradiation: In situ reflectance measurements of Fo₉₀, Fo₉₉₊, and SiO₂

Loeffler

Dukes

Christoffersen

et al. 2016

Meteorit & Planetary Scien

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“…Alternatively, the absorption of a second photon within CaS may open up additional channels capable of generating ions (discussed further in section 3.2). Note that the ablation threshold observed in similar experiments is typically around 1.0 J cm −2 [ Brunetto et al , ; Moroz et al , ], whereas the intensity of the PSD laser used here is typically several orders of magnitude below this (Table ). Only results below the 3.75 mJ cm −2 threshold are used to derive PSD cross sections.…”

Section: Resultsmentioning

confidence: 92%

Investigating potential sources of Mercury's exospheric Calcium: Photon-stimulated desorption of Calcium Sulfide

Bennett

McLain

Sarantos

et al. 2016

J. Geophys. Res. Planets

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Ground‐based and MErcury Surface, Space ENvironment, GEochemistry, and Ranging observations detected Ca0 and Ca+ in the exosphere of Mercury as well as unexpectedly high levels of sulfur on Mercury's surface. The mineral oldhamite ((Mg,Ca)S) could be a predominant component of the Mercury surface, particularly within the hollows identified within craters, and could therefore serve as a source of the observed exospheric calcium. Laboratory measurements on the photon‐stimulated desorption (PSD) of CaS powder (an analog for oldhamite) at a wavelength of λ = 355 nm have been conducted, utilizing resonance‐enhanced multiphoton ionization time‐of‐flight mass spectrometry to determine the yields and velocity distributions of Ca0. The desorbing Ca0 could be fit using two Maxwell‐Boltzmann components: a 600 (±30) K thermal component and a 1389 (±121) K nonthermal component, the latter accounting for ~25% of the observed signal. Cross sections for PSD using 3.4 eV photons were found to be 1.1 (±0.7) × 10−20 cm2 for Ca0 and 3.2 (±0.9) × 10−24 cm2 for Ca+. Adopting these cross sections, a Monte Carlo model of the release of Ca0 by PSD from the Tyagaraja crater finds the neutral microexosphere created from this process to be substantial even if only 1% CaS is assumed in the hollows. Diffuse reflectance UV‐visible measurements were made on the CaS powder to determine a bandgap, Eg, of 2.81 (±0.14) eV via the Tauc method.

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Alteration in the Raman spectra of characteristic rock‐forming silicate mixtures due to micrometeorite bombardment

Weber,

Pavlov,

Böttger

et al. 2024

J Raman Spectroscopy

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Innovative techniques are required for the in situ investigation of the surfaces of planetary bodies when landings are planned. Raman spectroscopy turned out as an excellent tool for fast mineralogical analyses on space missions. Contribution from a photoluminescence signal is not unexpected and is likely to be even more pronounced on celestial surfaces with a dilute or absent atmosphere exposed to strong space weathering, for example, micrometeorite bombardment. Such signals were found, for example, in Raman analysis of the probes from sample‐return missions. While photoluminescence is generally considered as an accompanying undesired product in the Raman spectral measurement, our studies show that some analytical information can be derived from this signal, and even more, due to the specific correlation of luminescence intensity with space weathering products. Therefore, we investigate the Raman spectra alteration of characteristic rock‐forming mineral mixtures (olivine, pyroxene and plagioclase) by micrometeorite bombardment, which is simulated by nanosecond‐pulse laser irradiation. The changes in the minerals are strongly dependent on the composition and structure. They range from disappearing changes in the minerals with simple chemistry and structure to complete amorphization of minerals with relatively low melting enthalpy. With Raman spectroscopy, we found out that the photoluminescence signals show resonant or anti‐resonant changes to specific mineral phases and amorphization. Furthermore, ablation‐induced iron nanoparticles of minerals containing Fe are detectable by Raman spectroscopy due to their alteration into iron oxides. Trapped volatiles in the matrices are analysed due to the formation of the compounds containing them. This broad spectrum of results indicating specific change phenomena due to space weathering can be effectively used for in situ Raman analysis in planetary missions.

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Space weathering of silicate regoliths with various FeO contents: New insights from laser irradiation experiments and theoretical spectral simulations

Cited by 29 publications

References 83 publications

Space weathering of silicates simulated by successive laser irradiation: In situ reflectance measurements of Fo₉₀, Fo₉₉₊, and SiO₂

Space weathering of silicates simulated by successive laser irradiation: In situ reflectance measurements of Fo₉₀, Fo₉₉₊, and SiO₂

Investigating potential sources of Mercury's exospheric Calcium: Photon-stimulated desorption of Calcium Sulfide

Alteration in the Raman spectra of characteristic rock‐forming silicate mixtures due to micrometeorite bombardment

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Space weathering of silicate regoliths with various FeO contents: New insights from laser irradiation experiments and theoretical spectral simulations

Cited by 29 publications

References 83 publications

Space weathering of silicates simulated by successive laser irradiation: In situ reflectance measurements of Fo90, Fo99+, and SiO2

Space weathering of silicates simulated by successive laser irradiation: In situ reflectance measurements of Fo90, Fo99+, and SiO2

Investigating potential sources of Mercury's exospheric Calcium: Photon-stimulated desorption of Calcium Sulfide

Alteration in the Raman spectra of characteristic rock‐forming silicate mixtures due to micrometeorite bombardment

Contact Info

Product

Resources

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Space weathering of silicates simulated by successive laser irradiation: In situ reflectance measurements of Fo₉₀, Fo₉₉₊, and SiO₂

Space weathering of silicates simulated by successive laser irradiation: In situ reflectance measurements of Fo₉₀, Fo₉₉₊, and SiO₂