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Journal ArticleDOI

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

J C Nickel, +3 more
- 01 Sep 1989 - 
- Vol. 22, Iss: 9, pp 730-738
TLDR
In this article, the absolute elastic and inelastic differential cross sections (DCS) for electron impact on molecular (atomic) species are described and illustrated by examples, and a method of determining absolute differential electron-molecule scattering cross sections is generally applicable and provides reliable results.
Abstract
Procedures and calibration techniques for measuring the absolute elastic and inelastic differential cross sections (DCS) for electron impact on molecular (atomic) species are described and illustrated by examples. The elastic DCS for the molecule under study is first determined by calibration against helium using the relative flow technique. The second step involves the production of energy-loss spectra for the instrument response function, the unfolding of overlapping inelastic structures and the normalization of inelastic intensities to the elastic cross sections. It is concluded that this method of determining absolute differential electron-molecule (atom) scattering cross sections is generally applicable and provides reliable results.

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Citations
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Journal ArticleDOI

A new normalization method for electron collision cross sections measured using skimmed supersonic jet beams

TL;DR: In this paper, a new technique for placing measured cross sections on an absolute scale is reported, as the traditional relative flow method used for effusive molecular beams does not apply to skimmed supersonic jet beams.
Journal ArticleDOI

Elastic and total cross-sections for electron scattering by acetylene in the intermediate energy range

TL;DR: In this article, a joint theoretical-experimental study on electron scattering by C2H2 in the intermediate energy range is presented, where the authors report calculated elastic differential, integral, and momentum transfer as well as total (elastic + inelastic) and absorption cross-sections at impact energies ranging from 10 to 500 eV.
Journal ArticleDOI

Differential scattering cross sections of neon at low electron energies

Xueying Shi, +1 more
- 28 Oct 1992 - 
TL;DR: In this paper, absolute differential electron scattering cross sections for neon are reported at selected energies from 0.25 to 7 eV over an angular range of 30' to 120' and the results are in very good agreement with the measurements of Williams (1979).
Journal ArticleDOI

Excitation of the 4 lowest electronic transitions in methanol by low-energy electrons

TL;DR: In this article, differential and integral cross sections for electronic excitation of methanol by low-energy electron impact were measured for the four lowest-lying excited states at incident electron energies from 9 to 20 eV and at scattering angles from 5° through 130°.
References
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Book

Data Reduction and Error Analysis for the Physical Sciences

TL;DR: In this paper, Monte Carlo techniques are used to fit dependent and independent variables least squares fit to a polynomial least-squares fit to an arbitrary function fitting composite peaks direct application of the maximum likelihood.
Journal ArticleDOI

Data Reduction and Error Analysis for the Physical Sciences.

TL;DR: Numerical methods matrices graphs and tables histograms and graphs computer routines in Pascal and Monte Carlo techniques dependent and independent variables least-squares fit to a polynomial least-square fit to an arbitrary function fitting composite peaks direct application of the maximum likelihood.
Journal ArticleDOI

The Threshold Law for Single Ionization of Atoms or Ions by Electrons

TL;DR: In this paper, the dependence of the yield on the energy just above a threshold is derived and the derivation is not rigorous because it circumvents some of the difficulties of the three-body problem by applying ergodicity, albeit in a weakened form.
Journal ArticleDOI

Two electrons in a coulomb potential. double-continuum wave functions and threshold law for electron--atom ionization.

TL;DR: In this paper, the Schrodinger equation for two electrons in a Coulomb field is studied in the critical region where both electrons have near-zero kinetic energies, and the main feature of this problem is that the mutual screening between the two electrons determines and is determined by the partition of the available energy between them.
Journal ArticleDOI

Absolute elastic differential electron scattering cross sections for He - A proposed calibration standard from 5 to 200 eV

TL;DR: In this article, the angular distributions for elastically scattered electrons were measured in a crossed-beam geometry using a collimated, differentially pumped atomic-beam source which requires no effective-path-length correction.
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