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1970 Lewis Selig Edelheit point defects copper anomalous x-ray transmission Borrmann measurements The effect of point defects in copper on the anomalous transmission of X-rays Koehler, James S. Edelheit, Lewis Selig 2011-07-14T14:27:46Z 2011-07-14T14:27:46Z 10000-01-01 1970 Anomalous X-ray transmission (Borrmann) measurements were made at 4.2 K on nearly perfect copper single crystals before and after irradiation at 20 K with 3 MeV electrons (total integrated flux 0.B7 X 101B electrons/em2). The intensity in the diffracted direction was measured for the (111), (222), (333), and (220) reflecting planes. The measured intensity changes were 1.15 t ,4%, 4.52 ± .6%, 8.90 ± .8%, and 4.06 + .8% respectively. A comparison of the observed intensity changes with theoretical predictions, assuming that the damage consists of isolated interstitials and vacancies, and using previously calculated displacements associated with these defects, indicates that the interstitial is not in the split (100) configuration. Possible configurations are the body centered interstitial or the split (111) interstitial. Measurements after annealing at BOoK and 3000K were made. The measurements indicated that defect clusters were formed when the irradiated crystal was heated to 80oK, and some clusters remained after annealing at room temperature. Submitted by Carolyn Mead (cmead2@illinois.edu) on 2011-07-14T14:27:46Z No. of bitstreams: 1 1970_edelheit.pdf: 2102984 bytes, checksum: 440b13beb328873eff869fc5f1b3fe80 (MD5) Made available in DSpace on 2011-07-14T14:27:46Z (GMT). No. of bitstreams: 1 1970_edelheit.pdf: 2102984 bytes, checksum: 440b13beb328873eff869fc5f1b3fe80 (MD5) Previous issue date: 1970 Restriction data tranferred 2014-07-01T11:33:07-05:00 Original Data Group with Access UIUC Users [automated] Release Date: none Reason: Thesis Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by Carolyn Mead (cmead2@illinois.edu) on 2011-07-14T14:27:46Z Item is restricted indefinitely. Thesis U of I Only 6065082 http://hdl.handle.net/2142/25806 en Dissertation / Thesis text Physics Physics University of Illinois at Urbana-Champaign Dissertation Ph.D.