Abstract
Presents a critical comparison and evaluation of the various techniques used to put triple differential (e, 2e) cross sections onto an absolute scale. The main emphasis is placed on their respective advantages, validity range and limitations. The methods of data analysis are discussed and analysed in detail. This study is illustrated by new high precision data on helium, as well as the most recently published ones. It is shown that, when high quality data are used (i.e. mainly measurements with good statistics and extending to small enough momentum transfer values) the methods based either on the Bethe sum rule or on an extrapolation of the generalised oscillator strength to the optical limit give good agreement for the absolute scale, with comparable accuracy (6-8%).
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