Mass spectrometric study of double photoionization of HBr molecules

The double photoionization of HBr molecules in the photon energy range of 25-55 eV, was studied in a mass spectrometric experiment. The HBr 2+ and Br 2+ product ions were detected by a photoelectron-photoion-coincidence technique. The H + + Br + formation, which follows the double ionization of HBr was studied by photoelectron-photoion-photoion-coincidence technique. The H + and Br + product ions in coincidence with one of the two ejected photoelectrons were measured. The number of coincidences, measured as a function of the photon energy were reported.