Measurements of photoelectron angular distributions for rotationally resolved transitions in para-H2+

Angularly and rotationally resolved measurements of photoelectron angular distributions for the X2ƒÃg+ (v+=0;N+ =0) ground state of para-H2+ are presented, over the photon energy range, 15.47¡V15.75 eV. This range includes most of the autoionising resonances that decay primarily into the ground vibrational ionic state. The measurements were performed using synchrotron radiation, a high-resolution hemispherical analyser and a magnetic angle changer. The value of the asymmetry parameter in this energy interval is close to 2, but sharp variations are observed at particular photon energies.