Electron and Ion Reactions in Molecular Solids: from astrochemistry to radiobiology

Details Electron and Ion Reactions in Molecular Solids: from astrochemistry to radiobiology Electron and Ion Reactions in Molecular Solids: from astrochemistry to radiobiology

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dmp.m5002h&link_type=abstract

American Physical Society, DAMOP Meeting, May 16-19, 2001 London, Ontario, Canada Bulletin of the American Physical Society, Vol

Mathematics

Logic

Scientific paper

Wherever ionizing radiation interacts with matter, it initiates reaction cascades involving ions, radicals, and ballistic secondary electrons; these reactions occur on fs time-scales, and may lead to substantial physical and chemical modifications of a medium. Here I present measurements of 0-80 eV electron and ion reactions in condensed films ranging from simple to complex, and astrophysical to biological in nature. Targets contain either: small molecules, hydrocarbons of increasing complexity (incl. bases, sugars, single/double stranded DNA), molecules on rare gas matrices, or mixed cryogenic films resembling astrophysical or planetary surface ices containing O2, H2O, methane, and aromatic hydrocarbons. The basic electron or ion reaction mechanisms and pathways are found to be fundamentally universal, but are modulated by the physical and chemical nature of the medium; depending on the latter, a reaction cascade may lead to different end-points, e.g. a decrease in molecular complexity via molecular fragmentations, or increases in complexity via secondary ion collision induced synthesis of larger molecules in hydrocarbon rich surface ices.

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