Abstract
Extensive modifications of an electrostatic electron spectrometer
of the hemispherical type are described. The purpose of the modifications
is to make the instrument more suitable for high‐resolution gas phase
spectroscopy. The changes concern substitution of electrical adjustments
for mechanical precision, improved flexibility in focusing, and a
new system of computer‐controlled power supplies and detector interface.
The instrument is also used for energy analysis of positive ions.
Conversion between positive and negative particle analysis is achieved
simply by reversing the polarities of all relevant voltages by a
number of switches. A gas cell with internal heating is described.
The influence of gas cell conditions on resolution is briefly discussed.
The computer programs used for spectrometer control, data acquisition,
spectrometer optimization, and calibration are described.
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