In the present work, the distorted-wave approximation is applied
to study the excitation of core-level electrons in OCS, CO2, CO and
CS2
molecules by electron impact. More specifically, we report calculated differential
and integral cross sections for the X1 Σ+ →1,3 Π
transitions in an incident energy range of 300–800 eV. We also report the ratios of
these cross sections for the corresponding transitions leading to the triplet
and singlet core-excited states as a function of incident energy. These
ratios are compared with the available experimental results for CO2
and CO molecules obtained by both conventional energy-loss
spectroscopy and the ejected-electron detection technique. The
results confirm the existence of a broad resonance for CO2
and CO molecules. Moreover, the good qualitative agreement between the
calculated and experimental ratios shows that the decays of the autoionizing
states are impact-energy independent. Quantitative agreement between theory
and experiment is also satisfactory.
In this work, we present a theoretical study on elastic electron collisions with the four C 2 N 2 isomers. More specifically, calculated differential, integral, and momentum transfer cross sections are reported in the 1 -100 eV energy range. Calculations are performed at both the static-exchange-absorption and the staticexchange-polarization-absorption levels. The iterative Schwinger variational method combined with the distorted wave approximation is used to solve the scattering equations. Our study reveals an interesting trend of the calculated cross sections for the four isomers. In particular, strong isomer effect is seen at low incident energies. Also, we have identified a shape resonance which leads to a depression in the calculated partial integral cross section.
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