Low energy electron scattering from pyridine using a Surko trap and beam

2021 ◽  
Author(s):  
David Stevens ◽  
Tamara Babij ◽  
J R Machacek ◽  
James P Sullivan
Keyword(s):  
Cross Section ◽  
Electron Scattering ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Low Energy ◽  
Energy Electron ◽  
Operational Parameters ◽  
R Matrix ◽  
National University ◽  
Low Energy Electron

Abstract This paper presents measurements of low energy electron scattering from pyridine. The low energy positron beamline at the Australian National University was used for these measurements, with a change in operational parameters allowing for the measurement of electron scattering processes. We have collected data for the low energy total cross section for electron scattering, as well as measurements of the differential cross sections (DCS) for electrons up to 3 eV impact energy. The operation of the beamline will be briefly outlined and data are compared to R-matrix and Schwinger multichannel theoretical calculations, as well as previous experimental data.

scholarly journals Quantitative Theory and Accurate Experiments: Low-energy Electron Scattering by He and H2 as Case Studies

1997 ◽  
Vol 50 (3) ◽  
pp. 473 ◽  
Author(s):  
Robert K. Nesbet
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Theoretical Calculations ◽  
Vibrational Excitation ◽  
Low Energy ◽  
Energy Electron ◽  
Scattering Data ◽  
Beam Scattering ◽  
Low Energy Electron ◽  
Estimated Error

Accurate low-energy electron scattering data are needed in many fields of physics. However, accurate experiments are difficult to design and to carry out. By 1967 low-energy electron–He cross sections had been measured by two different techniques, designed to provide accurate data. Unfortunately, the data differed by amounts well outside the estimated error bars. Despite the relative simplicity of the He atom, decisive theoretical calculations on the e–He system could not be done with methods available in 1967. After a decade of development of theoretical methodology it became possible in 1979 to carry out calculations with absolute estimates of residual error limits. The results were found to agree closely with the momentum transfer cross section deduced from electron swarm data and with recent beam data by improved techniques, but were inconsistent with the original beam data of 1965. More recently, a similar conflict exists between data measured for electron-impact vibrational excitation of the hydrogen molecule by electron swarm and beam techniques. This conflict has persisted despite great progress in beam scattering techniques and in theoretical methods. A brief review of the relevant electron scattering theory will be given.

scholarly journals Low-Energy Electron Scattering by CS2 Molecules

2000 ◽  
Vol 53 (6) ◽  
pp. 785 ◽  
Author(s):  
Márcio H. F. Bettega
Keyword(s):  
Cross Section ◽  
Electron Scattering ◽  
Bound State ◽  
Elastic Cross Section ◽  
Low Energy ◽  
Energy Electron ◽  
Shape Resonance ◽  
Low Energy Electron

We report the integral elastic cross section for low-energy electron scattering by CS2 molecules. To perform our calculations we used the Schwinger multichannel method with pseudopotentials.We have found, in a static-exchange calculation, a shape resonance around 1 eV that belongs to the Π u symmetry.With the inclusion of polarisation effects only in that symmetry, we show that the resonance becomes a bound state. This result is in agreement with other results available in the literature.

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