Abstract
Secondary ion emission from bio-molecular samples bombarded with ion beams was investigated. Emitted ions from arginine amino acid thin films were measured using a time-of-flight method under 10 keV Ar and 500 keV Au ion bombardments. For 500 keV ion irradiation, the molecular ion yield was about 1 x 10^-3 molecules/ion, which was 2 orders of magnitude larger than with 10 keV ion irradiation. As there are very few data on sputtering of bio-molecules under sub-MeV-energy range, the present work will contribute to understanding of emission mechanism caused by ion-beam irradiation.
