Abstract
Abstract Differential cross sections for Br−/HgBr2 and Cl−/HgCl2 have been obtained in the 0-7 eV energy range with two crossed-beams electron-impact mass spectrometers. The first one was equipped with a magnetic sector and a trochoidal monochromator, and has capability of going down to zero electron energy, and the second one fitted with a quadrupole mass spectrometer and cylindrical electrostatic filters, has facility for kinetic energy analysis and angular distribution measurements of negative ions. At zero energy Br− and Cl− formation proceeds through the X2et resonance ground state. At higher energy the Br− formation around 4.15 eV and the Cl− formation around 4.85 eV appear through the 2II 3 2 , 2II 1 2 resonance states. The Br− and Cl− ions are found to carry off half the available energy which is interpreted as the simultaneous atomisation in Hg+Br(Cl)+Br−(Cl−) of the HgBr2− (HgCl2−) resonance states.
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