Ion irradiation experiments relevant to cometary physics

Details Ion irradiation experiments relevant to cometary physics Ion irradiation experiments relevant to cometary physics

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jgr....9617547s&link_type=abstract

(International Conference on Laboratory Research for Planetary Atmospheres, 2nd, Charlottesville, VA, Oct. 21, 1990, Proceedings

Other

25

Cometary Atmospheres, Electron Irradiation, Galactic Cosmic Rays, Ion Impact, Ion Irradiation, Oort Cloud, Carbon, Ice, Organic Materials, Refractory Materials

Scientific paper

Results are reported for experimental studies on ion irradiation which are relevant to cometary physics and which support the hypothesis that the ion-produced cometary organic crust can 'survive' gas ejection from deeper layers and be as old as the comet itself. A study of IR and Raman spectra obtained in situ before, during, and after irradiation of frozen benzene clarifies the processes producing a 3D network of aromatic molecules linked together by linear chains. Other experimental data demonstrate the transition from crystalline to amorphous water ice induced by ion irradiation at temperatures between 10 and 100 K. The observation of amorphous ice cannot be considered, as it has been up to now, definitive proof of its formation and permanence at low temperature.

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