A laboratory study of meteor smoke analogues: Composition, optical properties and growth kinetics
作者： Russell W. Saunders , John M.C. Plane
DOI: 10.1016/J.JASTP.2006.09.006
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摘要: Abstract Meteoric smoke forms in the mesosphere from recondensation of metallic species and silica produced by meteoric ablation. A photochemical flow reactor was used to generate mimics using appropriate photolytic precursors Fe Si atoms an excess oxidant. The following systems were studied: (i) Fe+O 3 /O 2 , (ii) +H O, (iii) Fe+Si/SiO+O (iv) Si/SiO+O . resulting nano-particles captured for imaging transmission electron microscopy, combined with elemental analysis X-ray (EDX) energy loss (EELS) techniques. These generated particle compositions consistent with: O (hematite), FeOOH (goethite), SiO 4 (fayalite) (silica). Electron diffraction revealed that Fe-containing particles entirely amorphous, while displayed some degree crystallinity. formed fractal aggregates chain-like morphologies, whereas predominantly spherical compact appearance. optical extinction spectra measured 300 nm λ
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