The paper presents an apparatus designed for the absolute measurement of total electron–atom and electron–molecule cross sections at intermediate energy. This is the first reported instrument capable of measurements at energies higher than 1 KeV. The construction and operation of the apparatus are described. The performance of the apparatus is discussed for two configurations. The first was used to measure the already published data for He, N2, NO, and O2. New measurements for the e−–He system extending to 2000 eV are presented and discussed: these data were obtained with the second (improved angular resolution) setup.
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Dalba et al. (1981) studied this question.
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