J. Phys. IV France 03 (1993) C6-79-C6-89
Novel toroidal electrostatic electron energy analyserJ.H. FLEXMAN, J.F. WILLIAMS and P.A. HAYES
Centre for Atomic, Molecular and Surface Physics, Physics Department, The University of Western Australia, Nedlands 6009, Australia
The characteristics of a novel, double toroidal, electrostatic electron energy analyser, with input and output optics, have been established. The energy and angular dispersed image on the surface of a microchannel plate detector enables parallel data processing and significant gains in efficiency. The characteristics of the toroids and lenses, including time dispersion, have been modelled using standard relaxation techniques and are compared with measured values. The calculations predict hemispherical radial magnification and second order focusing with 0.7% accuracy. The differences between point and distributed object sizes, such as may occur with solid and gas targets, are indicated. Measured elastic differential cross sections for 50 eV electrons scattered from argon and an Auger spectrum from argon are in good agreement with modelled data.
© EDP Sciences 1993