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• W2113990085 abstract "Electrostatic accelerator ESA-2 is a multy-purpose tool for fundamental and applied research in nuclear and particle physics. Usage of ESA-2 in quality an implanter, and as a source of ions for conducting of investigations of solid-state materials by non-destructive control methods, such as, for example, the Rutherford backscattering (RBS) is discussed. The Rutherford backscattering spectrometer has been designed and assembled. The present paper deals with the interaction of 380 keV H + ions with Si surface at glancing angles corresponding to the quasi-channeling regime. The outcomes of the experimental researches of sliding interaction of beams of the accelerated protons with energy from 180 up to 350 keV with a surface of a dielectric capillary are presented. INTERACTION OF FAST HYDROGEN IONS WITH SILICON SURFACE AT GLANCING ANGLES OF INCIDENCE Angular distributions of 380 keV protons reflected from (111) surface of Si monocrystal were measured in the range of projectiles glancing angle from 0.3° up to 0.8°. It is shown that increase of glancing angle causes non-linear change of such distribution parameters as angular width of the front rise, angular width of the distribution, the maximum yield value. Registered energy spectrum of reflected particles for glancing angle of 0.5° consists of several peaks with practically constant angular intervals between them and maxima weakly reducing towards lower energy region. It is experimentally shown that the most energetic peak relates to the reflection from the very surface and the rest ones are caused by successive scattering of ions by inner silicon crystallographic planes [1]. Fig.1 is a scheme of the experimental setup used in Figure 1: Schematic of the experimental setup. the present study. Monoenergetic proton beam, generated by the Van de Graaf accelerator, is collimated by 1 mm circular diaphragms S1 and S2. Twinned diaphragm S3 is used for ion beam monitoring. The exit part of S3 has a diameter of 0.5 mm. One more 0.5 mm collimator S4 is placed in front of the sample to avoid the influence of the particles scattered at the edge of S3. The sample is placed on two-axis goniometer having an accuracy not worse than 10 -2 degree. Silicon surface-barrier detector with an aperture 0.3 mm is placed at a distance of 115 cm from the sample. The detector can move perpendicularly the ion beam axis direction in the range from 0 to 6.9 degrees with the velocity of 2.42·10 -3 degree per second. Measured angle divergence of the ion beam was not worse than ± 2.0·10 -2 degree. The energy of the proton beam was set by calibrated magnetic analyzer with the accuracy of ± 0.1 %. The overall measured energy resolution of the system including the energy spread of the ion beam did not exceed 19 keV." @default.
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• W2113990085 date "2006-01-01" @default.
• W2113990085 modified "2023-09-27" @default.
• W2113990085 title "ELECTROPHYSICAL COMPLEX ON BASIS OF THE ELECTROSTATIC ACCELERATOR ESA-2 FOR FUNDAMENTAL AND APPLIED INVESTIGATIONS" @default.
• W2113990085 hasPublicationYear "2006" @default.
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