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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

Cross sections for elastic scattering of electrons by CF3Cl, CF2Cl2, and CFCl3

TL;DR: The present independent atom method calculation typically supports the experimental evidence, within the screened additivity rule formulation, for each species and for energies greater than about 10-20 eV.
Journal ArticleDOI

Electron scattering from laser-excited barium: studies of the to transition

Y Li, +1 more
- 14 May 1996 - 
TL;DR: In this article, the authors report on measurements of the parameter and absolute differential cross section for electron-impact excitation of the state in barium from the metastable, isotropically populated level at 20 eV impact energy.
Journal ArticleDOI

Electron impact cross sections of vibrationally and electronically excited molecules

TL;DR: In this paper, a comprehensive survey of electron impact cross-sections for vibrationally and electronically excited molecules is presented, which includes the methods to produce and detect vibrationally excited molecules.
Journal ArticleDOI

Vibrational excitation of cis- and trans-1, 2-difluoroethenes by electron impact: effect of dipole moment on the threshold peaks

TL;DR: In this article, the role of dipole moment in threshold peaks in IR-active vibrations was measured in cis-and trans-difluoroethene with the aim of assessing the role.
Journal ArticleDOI

Cross sections for electron scattering by methanol in the intermediate-energy range

TL;DR: In this paper, the angular distributions of the energy-selected electrons are measured and converted to absolute cross sections using the relative flow technique, and the influence of the adsorption-desorption of methanol vapor on the surfaces inside of the gas-handling manifold is also studied.
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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