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

Register, D. F.; Trajmar, S.; Srivastava, Santosh K.

doi:10.1103/physreva.21.1134

Cited by 246 publications

(104 citation statements)

References 36 publications

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“…In the case of the simple phase fitting as used for spherical potentials, 37 N (k) would be unity and S = exp(iδ ). When dealing with only approximately spherical potentials, as in the present case, N (k) becomes an additional size-fitting parameter 38 to be determined together with the phase shifts δ . Obviously, this approximation changes the interpretation of the derived phase shifts.…”

Section: B Fitting and Integration Methodsmentioning

confidence: 99%

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

Hoshino

Horie

Kato

et al. 2013

The Journal of Chemical Physics

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Differential, integral, and momentum transfer cross sections have been determined for the elastic scattering of electrons from the molecules CF3Cl, CF2Cl2, and CFCl3.With the help of a crossed electron beam–molecular beam apparatus using the relative flow technique, the ratios of the elastic differential cross sections (DCSs) of CF3Cl, CF2Cl2, and CFCl3 to those of He were measured in the energy region from 1.5 to 100 eV and at scattering angles in the range 15° to 130°. From those ratios, the absolute DCSs were determined by utilizing the known DCS of He. For CF3Cl and CF2Cl2, at the common energies of measurement, we find generally good agreement with the results from the independent experiments of Mann and Linder [J. Phys. B 25, 1621 (1992)10.1088/0953-4075/25/7/030; Mann and Linder J. Phys. B 25, 1633 (1992)10.1088/0953-4075/25/7/031]. In addition, as a result of progressively substituting a Cl-atom, undulations in the angular distributions have been found to vary in a largely systematic manner in going from CF4 to CF3Cl to CF2Cl2 to CFCl3 and to CCl4. These observed features suggest that the elastic scattering process is, in an independently additive manner, dominated by the atomic-Cl atoms of the molecules. 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. Integral elastic and momentum transfer cross sections were also derived from the measured DCSs, and are compared to the other available theoretical and experimental results. The elastic integral cross sections are also evaluated as a part of their contribution to the total cross section.

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Section: B Fitting and Integration Methodsmentioning

confidence: 99%

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

Hoshino

Horie

Kato

et al. 2013

The Journal of Chemical Physics

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“…17, except from background helium gas. The present results are again compared to those of Register et al 60 and normalized to the latter at 54°. Firstly, we note that the count rate for the background measurement of Fig.…”

Section: Azimuthal-plane Angular Resolutionmentioning

confidence: 78%

“…The present data, with efficiency corrections made using the procedure outlined in Sec. VIII and employing elastic cross section of Register et al, 60 have been normalized to that of Murray and Read for best visual comparison. As can be seen, there is very good agreement between the angular distributions measured with two very different spectrometer designs.…”

Section: "E 2e… Resultsmentioning

confidence: 99%

“…It is therefore well suited to both assess the performance of our analyzer angular response and provide corrections to it. Figure 17 shows our results ͑solid circles͒ compared to those of Register et al 60 ͑open circles͒. To aid visual comparison, the data points of Register et al are joined by straight lines.…”

Section: Azimuthal-plane Angular Resolutionmentioning

confidence: 99%

“…This cross section has been previously measured 60 and calculated 61 to high accuracy and is known to vary smoothly with emission angle. It is therefore well suited to both assess the performance of our analyzer angular response and provide corrections to it.…”

Section: Azimuthal-plane Angular Resolutionmentioning

confidence: 99%

See 2 more Smart Citations

Invited Article: An improved double-toroidal spectrometer for gas phase (e,2e) studies

Lower

Panajotović

Bellm

et al. 2007

Review of Scientific Instruments

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A new spectrometer is described for measuring the momentum distributions of scattered electrons arising from electron-atom and electron-molecule ionization experiments. It incorporates and builds on elements from a number of previous designs, namely, a source of polarized electrons and two high-efficiency electrostatic electron energy analyzers. The analyzers each comprise a seven-element retarding-electrostatic lens system, four toroidal-sector electrodes, and a fast position-and-time-sensitive two-dimensional delay-line detector. Results are presented for the electron-impact-induced ionization of helium and the elastic scattering of electrons from argon and helium which demonstrate that high levels of momentum resolution and data-collection efficiency are achieved. Problematic aspects regarding variations in collection efficiency over the accepted momentum phase space are addressed and a methodology for their correction presented. Principles behind the present design and previous designs for electrostatic analyzers based around electrodes of toroidal-sector geometry are discussed and a framework is provided for optimizing future devices.

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Effective potential fore-atom scattering by DCS minimization at intermediate energies

Paikeday

1997

Int. J. Quant. Chem.

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ABSTRACT:The differential scattering cross section DCS for electrons scattered elastically by neon is studied using a model potential. The short-range part of the effective potential is represented by the Chebyshev approximation and the long-range polarization potential is represented by an energy-dependent function. The computed differential cross section obtained using the approximate effective interaction potential for electrons scattered by neon atoms in their ground state in the 50᎐100 eV energy range is compared with available published results. In the present study, a nonrelativistic Hartree᎐Fock wave function of the target atom is used to compute the short-range static part of the interaction potential and the parameters contained in the energy-dependent function are determined by the minimization of the DCS with respect to the angle and the incident energy. The resulting DCS in the angular range 2Њ -⌰ -178Њ is found to be in good agreement with the available experimental and theoretical results in the intermediate energy range.

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

Cited by 246 publications

References 36 publications

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

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

Invited Article: An improved double-toroidal spectrometer for gas phase (e,2e) studies

Effective potential fore-atom scattering by DCS minimization at intermediate energies

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