Abstract
A new apparatus has been developed to study the dissociative photoionisation of H 2 molecules using synchrotron radiation. A parallel-plate electrostatic analyser equipped with a micro-channel plate/position-sensitive detector system was used to improve the detection efficiency in this measurement. The H + kinetic energy distribution was measured in the photon energy region 27–40 eV. Below the threshold energy of the H 2 + 2pσ u state, the production of slow protons with ≈ 3 eV through the Q 1 states, converging to the H 2 + 2pπ u state, was seen at 34–36 eV. We detected the fast protons produced from the direct ionisation to the well known 2pσ u, 2pπ u and 2sσ g repulsive H 2 + states.
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