Modification of dust-grain structure by sputtering
نویسندگان
چکیده
منابع مشابه
Modification of Dust Grain Structure by Sputtering
We have applied the SRIM computer code to study the sputtering of some likely astrophysical grain materials, and we have shown that selective embedding of metallic projectiles offers a partial explanation of gas-phase depletions. We show that supernova shockwaves sweep a significantly larger mass of interstellar gas per unit time than the shockwaves generated by outflows in star-forming regions...
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We use a model of the dissipation regions in C-type shocks in which two grain fluids are included to evaluate the rates at which grain-grain collisions and sputtering inject elemental silicon and water into the gas phase. For physical parameters typical of star forming regions, and on the assumption that a substantial fraction of the evaporated silicon is efficiently converted in SiO, the two g...
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Motivated by space and laboratory applications, a theory is presented for ions trapped by a charged dust grain in a plasma. The grain's attractive Debye sphere confines ions after a collision. They shield the grain's considerable electric charge from external fields. Their number Ntrap is determined by a balance of the capture and loss rates. At steady state, Ntrap is independent of the collisi...
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ژورنال
عنوان ژورنال: Monthly Notices of the Royal Astronomical Society
سال: 2004
ISSN: 0035-8711,1365-2966
DOI: 10.1111/j.1365-2966.2004.07502.x