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Sökning: WFRF:(Dassanayake B)

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  • Dassanayake, B. S., et al. (författare)
  • Charge evolution and energy loss associated with electron transmission through a macroscopic single glass capillary
  • 2011
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section B. - : Elsevier BV. - 0168-583X .- 1872-9584. ; 269:11, s. 1243-1247
  • Tidskriftsartikel (refereegranskat)abstract
    • Charge (time) evolution and the angular dependence of incident electrons in the range 300-1030 eV through a single macroscopic glass capillary was studied. Charge measurements were done at a sample tilt angle of psi = 2' for observation angles 0= O' and 05 (both psi and 0 were measured with respect to the incident beam direction) at incident energies of 520.7 and 824.5 eV using a parallel-plate spectrometer. After equilibrium of transmission, electrons had lower average centroid (mean) energies than the respective primary beam values. Centroid energies of transmitted electrons at the centroid of the angular distribution (where the observation angle 0 is nearly equal to tilt angle of the sample psi) were found to decrease exponentially with increasing sample tilt angles for all the measured electron energies. This energy loss is attributed to inelastic scattering of electrons with the inner wall of the sample close to the capillary entrance. Furthermore, the centroid energies of the transmitted electron angular distributions at 520.7 eV were found to lose energy for angular positions away from the capillary axis (angular centroid position) for all tilt angles, indicating a higher degree of inelastic scattering at the edges of the angular distributions.
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  • Dassanayake, B. S., et al. (författare)
  • Electron transmission through a single glass macrocapillary : dependence on energy and time
  • 2011
  • Ingår i: Physica Scripta. - 0031-8949 .- 1402-4896. ; T144, s. 014041-
  • Tidskriftsartikel (refereegranskat)abstract
    • The transmission of electrons through an insulating single cylindrically shaped glass capillary of macroscopic dimensions has been investigated for electron energies from 300 to 1000 eV using a high-resolution electrostatic parallel-plate analyzer (spectrometer). The transmitted intensity decreased with increasing sample tilt angle relative to the beam direction, and had two regions: direct, where there is no interaction of the beam with the inner capillary wall, and indirect, where it does interact. From the full-width-at-half-maximum of the angular distributions, the indirect region was found to reveal a further two distinct areas of characteristics versus tilt angle with respect to elasticity/inelasticity of transmitted electrons. Electron transmission for the case of no tilt of the sample was found to be time dependent, due to charge-up of the capillary inner surface. The new results are compared with previous experimental data obtained using a 10x lower resolution spectrometer.
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  • Resultat 1-4 av 4

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