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- W2000306299 abstract "Laser irradiation experiments have been performed on powdered silicates (othopyroxene, clinopyroxene, and olivine) using a nanosecond pulse UV excimer laser (193 and 248 nm) to simulate the effects of space weathering induced on minor bodies of the Solar System by micrometeorite bombardment. We have used different fluences (from 0.05 to 2 J/cm2) to weather the samples, experimenting below and above the ablation threshold. All the irradiated materials have shown reddening and darkening of their UV–vis-NIR reflectance spectra. In addition we have found that: (1) below ablation threshold, weathering effects increase with increasing number of laser pulses, and with increasing fluence, confirming that a thermal process is active; (2) above ablation threshold, weathering is much stronger and efficient than in the previous case, and is independent on the number of pulses. We show that astrophysical time-scales, i.e. times necessary to obtain similar effects on planetary objects, are of about 108 yr for both olivine and pyroxene in the case of ablation. The time grows up to 1010 yr in the case of thermal effects. We infer that micrometeorite bombardment can be rightly simulated by laser irradiation only considering congruent laser ablation." @default.
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- W2000306299 date "2006-02-01" @default.
- W2000306299 modified "2023-10-01" @default.
- W2000306299 title "Space weathering of silicates simulated by nanosecond pulse UV excimer laser" @default.
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- W2000306299 doi "https://doi.org/10.1016/j.icarus.2005.10.016" @default.
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