The effect of excimer laser irradiation on mid-IR spectra of mineral mixtures for remote sensing

Weber, I.; Reitze, Maximilian P.; Heeger, Marcel; Adolphs, Thorsten; Morlok, A.; Stojic, Aleksandra N.; Hiesinger, H.; Arlinghaus, Heinrich F.; Helbert, J.

doi:10.1016/j.epsl.2021.117072

Cited by 7 publications

(4 citation statements)

References 41 publications

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“…Additionally, a study by Moroz et al (2014) determined that the amount of npFe generated through irradiation experiments would be insufficient to cause detectable optical darkening and attributed the albedo change to textural changes from micrometeorite bombardment. Several studies of meteoritic or impacted materials have indicated that the shock component of space weathering may also contribute to darkening of regolith and show shifts in MIR spectral features correlated with exposure to irradiation/shock (Morlok et al, 2017;Reitze et al, 2021;Weber et al, 2021).…”

Section: Known Effects Of Space Weathering On Ir Spectroscopymentioning

confidence: 99%

“…The TFs are emissivity minima with positions dependent on composition, and intensity dependent on particle size of the material, where fine particulates (<∼60 μm) have lower emissivity at TFs due to increased scattering (e.g., Cooper et al, 2002). Some laboratory studies have already shown correlations between MIR spectral feature shifts and space weathering in Apollo samples (Morlok et al, 2022) and irradiation experiments (Weber et al, 2021), while here, we focus on the darkening effect. By analyzing the effects of space weathering on these MIR features, combined with our previous knowledge of space weathering effects on VNIR spectra, we can use these data sets in tandem to create a more complete picture of lunar surface mineralogy.…”

Section: Known Effects Of Space Weathering On Ir Spectroscopymentioning

confidence: 99%

“…Some laboratory studies have already shown correlations between MIR spectral feature shifts and space weathering in Apollo samples (Morlok et al., 2022) and irradiation experiments (Weber et al., 2021), while here, we focus on the darkening effect. By analyzing the effects of space weathering on these MIR features, combined with our previous knowledge of space weathering effects on VNIR spectra, we can use these data sets in tandem to create a more complete picture of lunar surface mineralogy.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Albedo on the MIR Emissivity Spectra of Silicates for Lunar Comparison

et al. 2023

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Spectral observations of some parts of the lunar surface have long been shown to display unusual properties at visible and near-infrared (VNIR) wavelengths. The spectral shapes appear similar to those observed on Earth for minerals and rocks, but the darkest areas on the lunar surface are characterized by spectra with reduced band depths and steep red slopes (e.g., Adams & Jones, 1970;Fischer & Pieters, 1994;Hapke et al., 1970;Hawke et al., 2004). Today, we identify these optical effects as classic signs of space weathering of the lunar regolith.Space weathering is the overarching term for the sum of processes affecting the lunar regolith, most broadly, the physical breakdown and vaporization from micrometeoroid bombardment, and chemical alteration from solar wind irradiation (e.g.,

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Section: Known Effects Of Space Weathering On Ir Spectroscopymentioning

confidence: 99%

Section: Known Effects Of Space Weathering On Ir Spectroscopymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Effects of Albedo on the MIR Emissivity Spectra of Silicates for Lunar Comparison

et al. 2023

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“…After laser irradiation, the wavenumber, shape, and FWHM of the doublet peaks did not change substantially (Table A.3). The newly formed np-Fe 0 particles are pure metallic iron that have no Raman effects, and the potential reduction of the fluorescence-dominated background due to the formation of np-Fe 0 may facilitate a better interpretation of the individual mineral peaks by the Raman spectrometer (Weber et al 2021(Weber et al , 2022. Amorphization of the olivine surface may cause local disorder and result in the broadening of Raman peaks, as suggested in previous studies (Rouquette et al 2008;Santamaria-Perez et al 2016); however, the amorphous layer showed no substantial influence in our experiments.…”

Section: Raman Spectral Characteristics Of Altered Olivinementioning

confidence: 99%

Space weathering effects and potential spectral alteration on Phobos and the Moon: Clues from the Fe content of olivine

et al. 2023

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Context. Olivine responds to space weathering in the fastest and most profound way, which results in significant space weathering spectral alteration effects (SWSAEs) on airless silicate bodies. Although Mg-rich olivine (Fa10) has been subjected to extensive studies, SWSAEs of Fe-rich (Fa# > 20) or Fa-dominant (Fa# ⩾ 50) olivine are still poorly understood. Aims. We aim to systematically characterize the space weathering effects and the associated spectral alterations of Fe-rich olivine on the surface of Phobos and the Moon. Methods. We conducted nanosecond pulsed laser irradiation experiments on a set of synthetic Fe-rich olivine (Fa29, Fa50, Fa71, and Fa100) with energy levels simulated for Phobos and the Moon and analyzed the irradiated olivine for microscopic characteristics and near-infrared (NIR) and Raman spectroscopy. Results. Micron-level thick alteration layers are found in Fa100 compared to those hundreds of nanometers thick in Fa29, Fa50, and Fa71. With increasing irradiation energy levels and Fa# values, nanophase iron (np-Fe0) particles increase in size but decrease in quantity. The np-Fe0 formed via in situ decomposition are ubiquitously present, while those formed via vapor deposition are primarily found in Fa29 but rarely in Fa# ⩾ 50. The size fraction of intermediate (10–40 nm) and large (40–60 nm) np-Fe0 proportionally increases with Fa# values. The NIR spectra of weathered olivine show darkening over reddening in most cases, but Fa100 under the most irradiated condition shows brightening-reddening spectral effects. The Raman spectra of weathered olivine show a reduction in intensity without peak shifts. Conclusions. The Fa# values of olivine are a more critical factor in controlling the SWSAEs on Phobos than those on the Moon. If Phobos and Deimos contain substantial Fe-rich or Fa-dominant olivine, similar to Mars, thick alteration rims and large np-Fe0 formed via space weathering may cause darkening-reddening and potentially brightening-reddening spectral effects on the Martian moons.

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Mid-IR spectral properties of different surfaces of silicate mixtures before and after excimer laser irradiation

Weber

Reitze

Morlok

et al. 2023

Icarus

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The effect of excimer laser irradiation on mid-IR spectra of mineral mixtures for remote sensing

Cited by 7 publications

References 41 publications

Effects of Albedo on the MIR Emissivity Spectra of Silicates for Lunar Comparison

Effects of Albedo on the MIR Emissivity Spectra of Silicates for Lunar Comparison

Space weathering effects and potential spectral alteration on Phobos and the Moon: Clues from the Fe content of olivine

Mid-IR spectral properties of different surfaces of silicate mixtures before and after excimer laser irradiation

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