The content of this book describes in detail the results of the
present measurements of the partial and total doubly differential
cross sections for the multiple-ionization of rare gas atoms by
electron impact. These measurements show, beside other trends, the
role of Auger transitions in the production of multiply ionized
atoms in the region where the incident electron energy is
sufficient to produce inner shell ionization. Other processes like
Coster-Kronig transitions and shake off also contribute towards
increasing the charge of the ions. The incident electron having
energy of 6 keV, for example, in a collision with xenon atom can
remove up to nine electrons (*) X-ray-ion coincidence spectroscopy
of the electron xenon atom collisions is also described.
The present measurements of doubly differential cross sections
for the dissociative and non-dissociative ionization of hydrogen,
sulfur dioxide and sulfur hexa fluoride molecular gases by electron
impact are also described in the text of this book. The results of
the measurements for sulfur dioxide molecule show how this major
atmospheric pollutant can be removed from the atmosphere by
electron impact dissociation of this molecule. The present results
of the measurements for sulfur hexa fluoride give an insight into
the dissociation properties of this molecular gas, which is being
so widely used as a gaseous insulator in the electrical
circuits.
The book also describes the present measurements of the
polarization parameters of the fluorescence radiation emitted by
the electron-impact-excited atoms of sodium and potassium. In these
investigations the target atoms are polarized, therefore, the
measurements of the polarization parameters give information about
the electron atom interaction in terms of the interference, direct
and exchange interaction channels.
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