Abstract
Absolute angle-differential cross-section data are presented for excitation of the 3p54s manifold in argon by electron impact. The investigation focuses on the near-threshold region, where previous studies have revealed persistent disparities between measurements and theoretical predictions. For the present experiment, the time-of-flight (TOF) technique is employed. This method allows for scattered electrons to be measured over a broad range of energies with a constant transmission, thereby eliminating a potential major source of error in relating relative intensities of elastic and inelastic transitions inherent to other experimental techniques. The present experimental data are compared to theoretical results obtained in relativistic distorted-wave and various R-matrix (close-coupling) approaches, as well as to other recently published experimental data.
Highlights
The accurate determination and understanding of electron-impact-induced atomic collision processes is important for a number of reasons
The modelling of many systems of environmental and technological interest relies on the incorporation of crosssection data to describe collision processes at the microscopic scale
We have presented absolute differential cross section (DCS) data for the excitation of the 3p54s manifold in argon by electron impact
Summary
The accurate determination and understanding of electron-impact-induced atomic collision processes is important for a number of reasons. The modelling of many systems of environmental and technological interest relies on the incorporation of crosssection data to describe collision processes at the microscopic scale. These cross sections predict reaction rates for the range of possible collision outcomes comprising elastic scattering, excita-. The provision of precise cross-section data is vital to these applications. In elastic scattering and excitation from the ground state, cross sections can be measured more accurately than they can presumably be calculated. Measurements involving optically unstable initial states can be very difficult and are often impossible with currently available experimental techniques
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