Physics
Scientific paper
Nov 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002esasp.500..929s&link_type=abstract
In: Proceedings of Asteroids, Comets, Meteors - ACM 2002. International Conference, 29 July - 2 August 2002, Berlin, Germany. Ed
Physics
1
Space Weathering: Laboratory Simulations
Scientific paper
The space weathering process, which can explain spectral mismatch between S-type asteroids and ordinary chondrites, is simulated by nanosecond pulse laser irradiation. Spectral darkening and reddening are produced clearly by pulse laser irradiation. Through evaporation and recondensation, nanophase iron particles are formed on the irradiated sample. We confirmed nanophase iron particles not only on olivine but also on pyroxene. ESR (electron spin resonance) signals of the surface of laser-irradiated samples are measured. Strong ESR spectra, characteristic to nanophase iron particles, are observed on irradiated samples. ESR results show that quantity of nanophase metallic iron particles in olivine samples increases at higher space weathering degree.
Hiroi Takahiro
Kurahashi Erika
Nakamura Keiko
Sasaki Sho
Yamanaka Chihiro
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