Measurements of angular distribution for photoionization of mercury into the 5d9 2D5/2 ionic state over the energy range from 15 eV to 17 eV

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Differential cross sections for photoionization into the 5d 96s2 2D5/2 ionic state of mercury have been obtained over the photon energy range from 15 eV to 17 eV. By measuring the photoelectron emission at the angles of 0o and 90o with respect to the major axis of the polarization ellipse the variation of the asymmetry β-parameter for the 2D5/2 ionic state of mercury has been determined as a continuous function of photon energy over the above range. This energy range contains three series of autoionizing states converging to the 2D3/2 ionization limit. The measurements have been performed using the 5 m McPherson normal incidence monochromator at the Daresbury Synchrotron Radiation Source with a photon energy spread of typically 3 meV. © 2005 IOP Publishing Ltd.

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Journal of Physics B: Atomic, Molecular and Optical Physics

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