Radiation effects on grain materials
Abstract
Results are reported from experimental determinations of the effects of bombardment of frozen carbon-containing targets with an ion beam. Mixed vapors of CH4 and H2O were cooled in a 10 K chamber and bombarded by a keV-MeV beam, a technique which permitted measurements of the specimen thicknesses by means of backscattering data. The irradiation trials produced organic, yellow refractory materials within the chamber. Fluxes of 1.5 protons/sq cm yielded amorphous, fluffy residues with a density of 0.5 gr/cu cm and IR signatures typical of polymers. Increasing the flux to 17 protons/sq cm evolved the residue to an amorphous, carbon-like material. Increased flux preferentially removed H2 atoms and decreased the residue density. Higher-flux residues displayed IR signatures similar to that of charcoal.
- Publication:
-
Light on Dark Matter
- Pub Date:
- 1986
- DOI:
- 10.1007/978-94-009-4672-9_57
- Bibcode:
- 1986ASSL..124..253S
- Keywords:
-
- Cosmic Dust;
- Interplanetary Medium;
- Murchison Meteorite;
- Protostars;
- Radiation Effects;
- Irradiation;
- Methane;
- Lunar and Planetary Exploration