Modification of primordial ices by cosmic rays as simulated by cyclotron irradiation

Details Modification of primordial ices by cosmic rays as simulated by cyclotron irradiation Modification of primordial ices by cosmic rays as simulated by cyclotron irradiation

Dec 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992acm..proc..293k&link_type=abstract

In Lunar and Planetary Inst., Asteroids, Comets, Meteors 1991 p 293-296 (SEE N93-19113 06-90)

Computer Science

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Cosmic Rays, Cyclotron Radiation, Ice, Irradiation, Molecular Gases, Organic Materials, Vacuum, Acetylene, Cyclic Hydrocarbons, Ethane, Gas Chromatography, Infrared Spectroscopy, Linear Energy Transfer (Let), Liquid Chromatography, Mass Spectroscopy, Methane, Scanning Electron Microscopy

Scientific paper

Frozen CH4 and CH4/Ar mixtures closed into metal cuvettes and open to the vacuum were irradiated at 15 and 77 K with 10 - 20 MeV p and He-3(2+) ions in order to simulate the effect of cosmic rays on solid organic matter in space. Ices exposed to vacuum represent surfaces of icy systems whereas closed systems stand for bulk ices. The products were analyzed by MS, SEM, RBS, ERDA, H-1-NMR, HPLC, GC-MS, NEXAFS, and FT-IR. Volatile products consisted of a mixture of low molecular species, e.g., C2H2, C2H4, C2H6, and long linear aliphatic and olefinic compounds. The formation of polycyclic aromatic hydrocarbons (PAH's) and related species in solid CH4 is due to a multi-center reaction within one collision cascade and is governed by energy density effects with critical linear energy transfer values LT between 2 and 10 keV/micron. Open ices exhibit preferential hydrogen release resulting in an increased carbonization as compared to more hydrogen rich molecules protected inside large icy bodies.

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