Principles and procedures for determining absolute differential electron-molecule (atom) scattering cross sections

Nickel, J C; Zetner, P W; Shen, GF; Trajmar, S.

doi:10.1088/0022-3735/22/9/010

Cited by 218 publications

(142 citation statements)

References 13 publications

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“…The relative-angle-dependent cross sections were further normalized to the absolute points obtained at several scattering angles (40 • , 80 • , or 90 • ) using the relative flow technique [19][20][21] and Ar as a reference gas, whose DCSs are known from both theoretical [22] and experimental [18,23] studies. In this method signal intensities of scattered electrons for the target and the referent gas are compared, at fixed scattering angle (θ ) and electron energy (E), under the same experimental conditions.…”

Section: Methodsmentioning

confidence: 99%

Absolute cross sections for elastic electron scattering from methylformamide

et al. 2012

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Elastic electron scattering from gaseous methylformamide (N -methylformamide, C 2 H 5 NO) has been investigated. Absolute elastic differential cross sections (DCSs) were determined both experimentally and theoretically for the incident energies from 50 to 300 eV. The measurements were performed using a cross-beam technique, for scattering angles from 20 • to 110 • . Relative elastic DCSs were measured as a function of both the angle and the incident energy and the absolute DCSs were determined using the relative flow method. The calculations of electron interaction cross sections are based on a corrected form of the independent-atom method, known as the SCAR (screen corrected additivity rule) procedure and using an improved quasifree absorption model. Calculated integral cross sections have been presented, as well, both for methylformamide and formamide, in the energy range 10-1000 eV, and discussed. The results are compared with and discussed regarding existing data for other small molecules representing building blocks of large biomolecules.

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Section: Methodsmentioning

confidence: 99%

Absolute cross sections for elastic electron scattering from methylformamide

et al. 2012

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“…Absolute cross sections were determined by comparison against He using a relativeflow method [5]. A specially designed magnetic angle changer allowed for measurements up to a 180 • scattering angle [6].…”

Section: Methodsmentioning

confidence: 99%

High-resolution experiments andB-splineR-matrix calculations for elastic electron scattering from krypton

2011

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In a joint experimental and theoretical effort, we carried out a detailed study of elastic electron scattering from Kr atoms. Absolute angle-differential cross sections for elastic electron scattering were measured over the energy range 0.3−9.8 eV with an energy width of about 13 meV at scattering angles between 0 • and 180 • . Excellent agreement is obtained between our experimental data and predictions from a fully relativistic Dirac B-spline R-matrix (close-coupling) model that accounts for the atomic dipole polarizability through a specially designed pseudostate.

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“…Absolute values of the elastic cross sections were determined by the relative flow technique as described by Nickel et al [32] using the theoretical helium elastic cross sections of Nesbet [33] as a reference. The confidence limit is about ±15% for the elastic cross sections and ±20% for the inelastic cross sections (two standard deviations).…”

Section: Methodsmentioning

confidence: 99%

Electron collisions with CO: Elastic and vibrational excitation cross sections

Allan

2010

Phys. Rev. A

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Absolute differential elastic and vibrational excitation cross sections up to v = 11 were measured for CO in scattering angle ranges extending to 180 • at energies between 0.2 and 5 eV (and an elastic measurement at 10 eV). The lowest angles were 0 • for inelastic scattering and between 5 • and 20 • for elastic scattering, depending on energy. Integral cross sections were derived by integrating under the angular distributions and compared with previous beam and swarm measurements. The sum of the integral cross sections agrees very well with the available transmission measurements of the grand total cross section, thus validating the present measurements. The present elastic differential and integral cross sections are in excellent agreement with the best available measurement [Gibson et al., J. Phys. B 29, 3197 (1996)], but the v = 1 inelastic cross section is about 25% higher. This could have consequences for simulations of cometary and planetary atmospheres.

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Principles and procedures for determining absolute differential electron-molecule (atom) scattering cross sections

Cited by 218 publications

References 13 publications

Absolute cross sections for elastic electron scattering from methylformamide

Absolute cross sections for elastic electron scattering from methylformamide

High-resolution experiments andB-splineR-matrix calculations for elastic electron scattering from krypton

Electron collisions with CO: Elastic and vibrational excitation cross sections

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