Measurements of the critical angle for channeling of heavy ions in copper using characteristic X-ray generation
- 1 January 1972
- journal article
- research article
- Published by Taylor & Francis in Radiation Effects
- Vol. 12 (1-2), 7-11
- https://doi.org/10.1080/00337577208231116
Abstract
Measurements are presented of ψ1/2, the width of the dip in the yield of CuL X-rays when Ne+, Ar+, Kr+ and Xe+ of 150–350 keV are channeled in the axis of copper. Absorption of the X-rays and the slowing down of the beam are shown to limit the depth from which the detected X-rays can come. The magnitude of the effect of multiple scattering on the measured values of ψ1/2 is shown to be small for all the projectiles except nech. The data has a dependence on (Z 1/E) which is intermediate between that of the critical angles ψ1 and ψ2. A numerical calculation of critical angle gives good agreement with the data. At low energy the calculation uses a potential which is a sum of screened Coulomb and Born-Mayer terms; at higher energy screened Coulomb alone is adequate. A simple analytical expression for the critical angle, based on a 1/r2 atomic potential, may be used as an approximation to the results.Keywords
This publication has 9 references indexed in Scilit:
- A precision goniometer for use in clean vacuum conditionsNuclear Instruments and Methods, 1971
- Coherence properties of spontaneous radiation from a large Dicke systemPhysics Letters A, 1971
- A new end-window variable geometry x-ray proportional counterNuclear Instruments and Methods, 1970
- Channeling of MeVIons in Tungsten and Other Crystals: An Intercomparison of Rutherford Scattering and of CharacteristicandX-Ray YieldsPhysical Review B, 1969
- Directional effects of sputtering of a single gold crystal under bombardment by heavy ionsCanadian Journal of Physics, 1969
- Born-Mayer-Type Interatomic Potential for Neutral Ground-State Atoms withtoPhysical Review B, 1969
- Critical angles for channeling of low energy ions in tungstenCanadian Journal of Physics, 1968
- Single-crystal sputtering including the channeling phenomenonCanadian Journal of Physics, 1968
- Characteristic X-Ray Production in theShell of Copper by Low-Energy (100- to 500-keV) ProtonsPhysical Review B, 1964