Exit-Angle Dependence of Neutral Fraction in MeV Hydrogen Beams Straightly Transmitted through a Thin Aluminum Foil

概要

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Neutral fractions are measured for ions transmitted parallel to the beam direction at the incidence of (0.3-0.6) MeV H^+ beams on a poly-crystalline aluminum foil with a variance in the angle of incidence θ. The fraction measured for the equivalent ion-energy decreases with the decreasing angle of incidence. The relative difference between the fractions at the normal (θ = 900°) and inclined (θ = 300°) incidence increases slightly with the increasing energy of the ions. The dependence of fraction on the angle is calculated by using a model for the charge-exchange that includes not only the electron loss from and electron capture into the 1s state of hydrogen, but also the electron loss after an excitation of hydrogen in collisions with the atoms on the topmost layer of the surface. The electron loss of the excited hydrogen enhances the decrease of the fraction at the inclined incidence and this improves the calculated results to reproduce the experimental one.
社団法人日本物理学会の論文
2002-09-15