The role of absorption in large-angle elastic scattering

Went, Michael; Vos, Maarten

doi:10.1016/j.elspec.2008.10.001

Cited by 6 publications

(12 citation statements)

References 20 publications

(25 reference statements)

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“…However, the experiment shows a clear low-intensity signal, which changes in nontrivial ways with changing scattering conditions, as was shown in the case of Xe, Ar, and CH 4 in Refs. [7,8]. Theoretical understanding of these spectra was limited.…”

Section: Introductionmentioning

confidence: 99%

Understanding energy loss in large-angle scattering of keV electrons from Ar and Ne

et al. 2011

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We present measurements of the spectra of electrons with energy between 0.6 and 2.25 keV elastically and inelastically scattered from Ar and Ne over large angles (from 3 • to 135 • ). The intensity of the first loss feature [np → (n + 1)s], relative to that of the elastic peak, was determined and compared with the results of relativistic distorted-wave calculations (for the energy loss part) and a relativistic optical potential method (for the elastic peak). Good agreement was found. The distorted-wave calculations are compared with first Born calculations. At small angles, both theories coincide and estimates of the optical oscillator strength are obtained. However, at large angles, the first Born approximation predicts negligible intensity, in strong contrast to the distorted-wave theory and the experimental data. The implications of these results for the interpretation of measurements of the generalized oscillator strength are discussed.

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Section: Introductionmentioning

confidence: 99%

Understanding energy loss in large-angle scattering of keV electrons from Ar and Ne

et al. 2011

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“…For each event the program calculates, from the combination of offset voltage and detection coordinate, the energy loss of the scattered electron. Under these large-angle scattering conditions there exists a small intensity at larger energy loss values 5 with well-defined sharp structures. Resolving these structures, in the presence of the huge elastic peak is a challenging test of the detection method.…”

Section: Andmentioning

confidence: 99%

“…This is due to electrons that have scattered elastically from a Xe atom, and created an electronic excitation at that atom during the scattering process. 5 Note however that the intensity of the loss structures seems to depend on the beam current. This is a consequence of the normalization procedure followed and we explain this pitfall next.…”

Section: Andmentioning

confidence: 99%

“…A scattering angle of 45°was used, see Ref. 5 for more background on this type of measurement. The results were normalized in such a way that there are 10 6 counts in the elastic peak and are displayed in Fig.…”

Section: Andmentioning

confidence: 99%

“…For completeness we describe the electron optics part of the spectrometer in some detail. Previous results of the spectrometer, using a resistive anode ͑Quantar Technology͒ have been published, [4][5][6] and a comparison of spectra obtained in both ways is made.…”

Section: Introductionmentioning

confidence: 99%

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Electron spectroscopy using two-dimensional electron detection and a camera in a single electron counting mode

Vos

Went

Weigold

2009

Review of Scientific Instruments

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A brief description is given of an economical implementation of the read out of a two-dimensional detector in an electron spectrometer by a charge coupled device camera, using a pulse counting mode. Count rates up to 10 kHz can be handled in this way. A comparison with results obtained using a resistive anode detector is given for the case of electron scattering from Xe atoms. Good agreement was obtained between both detection techniques, establishing the validity of the method described here.

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Electron scattering from Xe: the relation between the differential elastic cross section and shape and intensity of the energy loss spectra

Vos¹

2010

J. Phys. B: At. Mol. Opt. Phys.

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The measurement of the energy loss spectra of energetic electrons scattered from Xe over large angles is reported. The incoming energy was chosen between 600 eV and 1550 eV. The calculated Xe elastic scattering cross section has a sharp minimum for 750 eV electrons near 135°. This minimum is confirmed by studying a Xe–H2 mixture and separating their elastic peak based on the recoil effect. The energy loss part of the Xe spectra is rich in structure. Surprisingly the shape and intensity (relative to the elastic peak) changes dramatically if one approaches the scattering conditions for which the elastic cross section has a minimum. These observations are rationalized by describing the inelastic intensity semi-classically, as a consequence of a two-step process occurring at the same atom involving scattering from the nucleus and an electronic excitation. The change in shape of the loss spectra is attributed to a large increase in relative intensity of the dipole-forbidden transitions near sharp minima in the elastic cross section.

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The role of absorption in large-angle elastic scattering

Cited by 6 publications

References 20 publications

Understanding energy loss in large-angle scattering of keV electrons from Ar and Ne

Understanding energy loss in large-angle scattering of keV electrons from Ar and Ne

Electron spectroscopy using two-dimensional electron detection and a camera in a single electron counting mode

Electron scattering from Xe: the relation between the differential elastic cross section and shape and intensity of the energy loss spectra

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