Photofragment imaging from mass-selected ions using a reflectron mass spectrometer I. Development of an apparatus and application to Mg+–Ar complex

Abstract

The velocity and angular distributions of Mg+(2P3/2) produced by photolysis of Mg+–Ar complex at 4.66eV were observed using an apparatus set up for imaging fragment ions from mass-selected ions. The translational energy Et and the anisotropy parameter β were measured to be 640±80cm−1 and 1.03±0.05, respectively. The binding energy of Mg+–Ar in the ground state, estimated to be 1180±80cm−1, agreed with those reported in the literature. We have demonstrated that the recoil energy as small as 100meV can be resolved using this apparatus.