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http://hdl.handle.net/11375/12387
Title: | X-ray Production in Low Velocity Heavy Ion-Atom Collisions |
Authors: | Stott, Ronald William |
Advisor: | Waddington, J. C. |
Department: | Physics |
Keywords: | Physics;Physics |
Publication Date: | Mar-1978 |
Abstract: | <p>Two aspects of x-ray production have been studied in the collisions of slow heavy ions with heavy atoms. One part of this study deals with the continuum x-rays produced by the collision of ion beams with gold target atoms while the other part deals with the double K-vacancy production in collisions of 80 MeV iodine beams with atoms of atomic numbers near that of iodine.</p> <p>Beams of four different ions ranging in atomic number from Z=6 (carbon) to Z=35 (bromine) and having the same velocity (v ∼ or = 0.04 c) bombarded gold atoms to produce very similar radiation continua extending from 20 keV photon energy. The observed radiation continua cannot be explained, in their entirety, as molecular orbital x-rays.</p> <p>The double K-vacancy production was produced in the bombardment by an iodine beam of seven thin targets ranging from silver to lanthanum. The double vacancies were detected by observing two K x-rays emitted simultaneously using a coincidence technique with solid state detectors. The energy differences of the K x-rays emitted have been determined as well as the nature of the sharing of vacancies between target and projectile atoms. Models for double K-vacancy production considered include the molecular orbital multiple collision approach and the binary encounter formalism of direct Coulomb excitation. Also a calculation of the double to single K-vacancy ratios was made using a double L-vacancy multiple collision MO mechanism in which the double to single L-vacancy cross section ratio was treated as a free parameter.</p> |
URI: | http://hdl.handle.net/11375/12387 |
Identifier: | opendissertations/728 1871 1057823 |
Appears in Collections: | Open Access Dissertations and Theses |
Files in This Item:
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fulltext.pdf | 3.28 MB | Adobe PDF | View/Open |
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