A modified fountain spectrometer for measuring double differential cross sections in ion-atom collisions

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Abstract
An electron energy analyser has been designed using the concept of the 'fountain spectrometer' and the 30 degrees plane electrostatic field configuration. The advantages of the design are that measurements at a number of scattering angles from 0 to 120 degrees can be made simultaneously. The performance of the analyser is illustrated by measurements of the electron distributions from H+ on He collisions, which show the processes of charge exchange into the continuum and autoionisation of the doubly excited He atom.

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