Measurement of double differential cross sections of gaseous isoleucine molecule by MeV ion-impact ionization

Double differential cross sections (DDCSs) for ionization by 2 MeV He+ ions have been measured for gaseous amino acids of isoleucine using a crossed beam method. Ejected electrons with energies below 600 eV were analyzed by a 45-degree electrostatic analyzer which was movable inside a collision chamber from 15 to 165 degrees with respect to the incident beam direction. K-LL Auger peaks of carbon, nitrogen, and oxygen were observed strongly with expected intensities from the number of constituent atoms in an isoleucine molecule. Binary encounter peaks were also observed at angles smaller than 90 degrees. (author)