Impact ionisation spectra of cosmic dust analogues

Details Impact ionisation spectra of cosmic dust analogues Impact ionisation spectra of cosmic dust analogues

Dec 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011agufm.p42a..06k&link_type=abstract

American Geophysical Union, Fall Meeting 2011, abstract #P42A-06

Astronomy and Astrophysics

Astronomy

[5494] Planetary Sciences: Solid Surface Planets / Instruments And Techniques, [6015] Planetary Sciences: Comets And Small Bodies / Dust, [6015] Planetary Sciences: Comets And Small Bodies / Dust, [6022] Planetary Sciences: Comets And Small Bodies / Impact Phenomena

Scientific paper

The Cassini dust detector CDA collected a few impact spectra of grains which are most likely of interstellar origin. Such spectra provide unequivocal information about the composition of solid material embedded in the interstellar medium, while the current knowledge of the composition of interstellar dust stemming dominantly from astronomical is limited. Fortunately, interstellar grains can be found even in the vicinity of the Earth orbit because the solar system currently traverses the so-called Local Interstellar Cloud (LIC). The interpretation of impact mass spectra is difficult because (i) the impact ionisation is a non-equilibrium process, (ii) new chemical compounds may form in the impact plasma, and (iii) the likelihood to detect elements or molecules in the resulting spectrum depends on the impact energy. To retrieve reliable information about the composition, the CDA spectra need to be related to spectra obtained from impact experiments with dust analogous in a dust accelerator facility. To this aim we performed impact experiments with cosmic dust analogues in a dust accelerator facility. We recorded spectra of sub-micron pyroxene grains ground from a natural Spinel-Lherzolite sample using a high resolution impact mass spectrometer as well as the CDA flight spare unit. In this talk we will report about calibration experiments using the 2MV Van-der-Graaf dust accelerator in Heidelberg.

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