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题名: Optical spectroscopic characterizations of laser irradiated olivine grains
作者: Yang, Yazhou; Zhang, Hao; Wang, Ziwei; Yuan, Ye; Li, Shaolin; Hsu, Weibiao; Liu, Chujian
刊名: ASTRONOMY & ASTROPHYSICS
出版日期: 2017
卷号: 597, 页码:-
英文摘要: Context. Visible and near-infrared spectra of asteroids are known to be susceptible to nanophase irons produced by space weathering processes, thus making mineral identifications difficult. Mid-infrared spectroscopy may retain more mineral features owing to its lattice vibrational nature.Aims. We investigate the structure and reflectance spectral feature changes of olivine grains before and after simulated space weathering.Methods. We irradiate olivine grains by using pulsed laser to simulate varying degrees of micrometeorite bombardments. Reflectance measurements from 0.5 to 25 mu m and radiative transfer calculations were carried out in order to compare them with each other.Results. Both the experimental simulations and modeling results indicate that the mid-infrared spectral features of olivine grains can survive the intense irradiations. Although the Christansen Feature is slightly shifted to longer wavelength, major vibrational bands remain essentially unchanged, because the lattice structure is quite immune to even the strongest irradiations, as revealed by both the X-ray diffraction and Raman scattering measurements.Conclusions. Mid-infrared spectroscopy is much more immune to productions of nanophase irons and amorphous materials and thus may be used more reliably in remote detections of minerals on asteroid surfaces.
语种: 英语
内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/17443
Appears in Collections:中国科学院紫金山天文台研究生部_学生文章

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