Low energy (1–19 eV) electron scattering from condensed thymidine (dT) II: comparison of vibrational excitation cross sections with those of tetrahydrofuran and the recalibrated values of thymine

2019 ◽  
Vol 21 (43) ◽  
pp. 23818-23825 ◽  
Author(s):  
V. Lemelin ◽  
A. D. Bass ◽  
P. Cloutier ◽  
L. Sanche
Keyword(s):  
Electron Scattering ◽  
Cross Sections ◽  
Vibrational Excitation ◽  
Low Energy ◽  
Energy Electron ◽  
Excitation Cross Sections ◽  
Low Energy Electron

Comparison of absolute vibrational cross sections for low-energy electron scattering from condensed thymidine with those of tetrahydrofuran and thymine.

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.

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