Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977mnras.178p..49d&link_type=abstract
Monthly Notices of the Royal Astronomical Society, vol. 178, Feb. 1977, p. 49P-51P. NSF-supported research.
Astronomy and Astrophysics
Astronomy
21
Magnesium Compounds, Proton Irradiation, Radiation Damage, Silicates, Space Environment Simulation, Cosmic Rays, Enstatite, Infrared Spectra, Olivine, Powder (Particles), Proton Energy, Solar Wind
Scientific paper
Results are reported for an experiment in which finely powdered uniform samples of olivine and enstatite were bombarded by protons with energies of 1.5 to 2.0 MeV. Spectra of irradiated and untreated materials in the IR region from 2.5 to 25 microns are compared. No measurable changes are found in any of the spectra, despite radiation doses ranging from 5 by 10 to the 15th power to 7 by 10 to the 17th power protons/sq cm and despite the fact that the proton energies exceeded the silicate bond energies by some six orders of magnitude. The amount of cosmic-ray protons that would bombard a silicate particle in space is estimated to be well below the doses reported, and reasons are considered for the lack of change in the IR spectra after proton bombardment. It is concluded that since radiation damage from MeV protons should have little effect on the IR spectra of crystalline silicates, the almost featureless astronomical IR spectra cannot easily be explained in terms of radiation-damaged crystalline silicates.
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