Simulation of the Ion Modification Processes in the Silicate Dust of Protoplanetary Disks
Source: Solar System Research, Volume 38, Number 1, January 2004 , pp. 59-65(7)
Publisher: MAIK Nauka/Interperiodica
Abstract:The modification of crystalline olivine under irradiation with 1.43-MeV deuterons was studied experimentally. For the first time, the partial destruction of olivine in the surface (100–200 nm) layer was found at a current density of 5–10 A/cm2. This effect is caused by ionization and desorption of Mg and Fe atoms at deuteron fluences (3–8 × 1016 cm–2) which are substantially below the amorphization threshold. It was suggested that the negative charge of the anion group SiO44– is neutralized by the interaction with the deuterium ions and Frenkel pairs. The mechanism of sputtering of the crystalline olivine surfaces under irradiation with H, D, He, and Ar ions was studied using of the TRIM 98 program.
Document Type: Research Article
Affiliations: 1: Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, ul. Kosygina 19, Moscow, 117975 Russia 2: Institute for Nuclear Research, Russian Academy of Sciences, pr. Shestidesyatiletiya Oktyabrya 7a, Moscow, 117312 Russia
Publication date: January 2004