Impact Ionisation Mass Spectra of Mineral Microparticles

Details Impact Ionisation Mass Spectra of Mineral Microparticles Impact Ionisation Mass Spectra of Mineral Microparticles

Oct 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011epsc.conf..834h&link_type=abstract

EPSC-DPS Joint Meeting 2011, held 2-7 October 2011 in Nantes, France. http://meetings.copernicus.org/epsc-dps2011, p.834

Physics

Scientific paper

We present mass spectra derived from the impact ionisation plasmas generated by the hypervelocity impacts of mineral microparticles over a range of speeds. The mineral microparticles were made from silicates (olivine, pyroxene, anorthite) and pyrrhotite and accelerated to velocities of 1->30 km s-1 using the Van de Graaff electrostatic accelerator at the Max Planck Institut für Kernphysik, Heidelberg [15]. The mass spectra were produced using high resolution reflectrontype instruments (e.g. LAMA etc. [20, 19, 18]) intended for use as space-based dust telescopes. We show that, if spectra are obtained over a range of impact velocities, it is possible to identify species from the bulk mineral material even if there are significant contributions to the spectra from organic or anthropogenic contaminants. In some cases it is also possible to infer the composition of the mineral, based on unique fragment and cluster ions.

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