Absolute differential cross sections for elastic scattering of electrons by helium, neon, argon and molecular nitrogen

Jansen, R.; Heer, F. J. de; Luyken, H J; Wingerden, B van; Blaauw, H J

doi:10.1088/0022-3700/9/2/009

Cited by 272 publications

(111 citation statements)

References 38 publications

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“…The experimental validation of these approaches is usually the comparison with the absolute measurement of the elastic peak intensity as a function of scattering angle as was done for noble gases, see e.g. [8,9]. The calculated cross sections with and without absorption are plotted in Fig.…”

Section: Introductionmentioning

confidence: 99%

The role of absorption in large-angle elastic scattering

Went

Vos

2009

Journal of Electron Spectroscopy and Related Phenomena

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a b s t r a c tThe measurements of energy loss distributions obtained in electron scattering experiments at high momentum transfer are presented for Xe, Ar and methane. The spectra show a large variety of intensity distributions, clearly different from those obtained in measurements at the dipole limit. The fraction of the intensity present in the energy loss distribution compared to the elastic peak is significant, but is in line with the reduction of the elastic cross section due to absorption. It is argued that, if similar effects are present in the condensed phase, they should be dealt with in any quantitative analysis of electron transport in matter, as is often done using Monte Carlo simulations. This argument is worked out in some detail for Reflection Electron Energy Loss Spectroscopy.

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Section: Introductionmentioning

confidence: 99%

The role of absorption in large-angle elastic scattering

Went

Vos

2009

Journal of Electron Spectroscopy and Related Phenomena

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“…The TCS results are compared with the theoretical results calculated using the EBS method (Byron and Joachain [9]) and the optical potential model (OM) (Byron and Joachain [10]), and with the experimental results of Dalba et al [11], Blaauw et al [12], and Kauppila et al [13]. Detailed comparisons of the present DCS values with the theoretical results calculated using the EBS and OM theories and experimental results of Bromberg [14], Sethuraman et al [15] and Jansen et al [16] for the energies 200 and 500 eV are shown in Tables 3 and 4, respectively. The present TCS values are smaller than those obtained from the EBS and OM methods.…”

Section: Resultsmentioning

confidence: 59%

Elastic Scattering of Electrons by Helium Atoms at Intermediate Energies

Chhaya

Tarwadi

Chhag

1993

Zeitschrift Für Naturforschung A

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The unitarised Eikonal Born series (UEBS) method has been used successfully by Byron et al. for elastic scattering of electrons and positrons by hydrogen atoms. Here an attempt is made to apply the UEBS method in the case of elastic scattering of electrons by helium atoms. The total and differential cross sections are calculated for the energy range 100-700 eV. The results are compared with experimental and other theoretical results. It is found that the results obtained with the UEBS method agree best with the experimental results.There is no simple yet satisfactory method for computing the scattering of electrons by helium atoms in the intermediate energy region. After the introduction of the Eikonal approximation in the potential scattering theory by Moliere [1], Glauber [2] extended it by using a frozen target approximation to convert the many body scattering problem into a potential scattering problem in which the potential depends on the coordinates of the target. However this could not be free from some drawbacks (Byron et al. [3]). To eliminate the deficiencies of the eikonal approximation and the Glauber many body generalization, Byron and Joachain [4] formulated the Eikonal-Born series (EBS) method. But the EBS method was not unitarised. On the other and, Wallace [5,6] introduced a systematic correction to the Eikonal phase that did not account, however, for long range polarization effects at small angles and represented absorption inadequately. To eliminate these difficulties, Byron et al. [7] suggested to remove the second order Wallace term / W2 from the Wallace amplitude / w and to replace it by the second Born term f B2 . The direct amplitude thus obtained was called the Unitarised Eikonal Born series (UEBS) amplitude. They applied the UEBS method successfully to the elastic scattering of electrons and positrons by hydrogen atoms in the energy range 100 to 400 eV [7] and obtained better results than those obtained with the other methods. In the present investigation the UEBS method is applied to the elastic scattering of electrons by He atoms in the intermediate energy range.Reprint requests to Dr. V. M. Chhaya, Department of Physics, Saurashtra University, Rajkot 360 005, India.The interaction potential between the electron and the helium atom in the direct arrangement channel can be expressed as (in atomic units) -00 0932-0784 / 93 / 0100-477 $ 01.30/0. -Please order a reprint rather than making your own copy. Unauthenticated Download Date | 5/11/18 8:34 AM

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“…To our knowledge, only elastic data are available from experiment [13]. Therefore, we are not able to evaluate a priori the overall angular resolution error of our measurements.…”

Section: Resultsmentioning

confidence: 99%

“…Therefore, we are not able to evaluate a priori the overall angular resolution error of our measurements. To the first approximation, the Born formula predicts the differential cross section constant in angle (at near-to-zero angles) and energy (see [8,13]). For these reasons, we can roughly assume that the angular resolution error rises linearly with energy and with the angular acceptance of the detector.…”

Section: Resultsmentioning

confidence: 99%

Total cross sections for positron scattering on argon and krypton at intermediate and high energies

Karwasz

Barozzi

Brusa

et al. 2002

Nuclear Instruments and Methods in Physics Research Section B:

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Preliminary total cross section data for positron scattering on argon and krypton between 250 and 5000 eV are presented. A Ramsauer-type apparatus, previously used for electron-scattering measurements has been modified. To check for the convergence between electron and positron total cross sections, a semiempirical analysis has been applied. The analysis for argon indicates an asymptotic convergence for electron and positron projectiles -the high energy parameters of the both fits are equal within the uncertainty limits. No such a clear conclusion is possible with the present data up to 5000 eV for krypton. Ó

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Absolute differential cross sections for elastic scattering of electrons by helium, neon, argon and molecular nitrogen

Cited by 272 publications

References 38 publications

The role of absorption in large-angle elastic scattering

The role of absorption in large-angle elastic scattering

Elastic Scattering of Electrons by Helium Atoms at Intermediate Energies

Total cross sections for positron scattering on argon and krypton at intermediate and high energies

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