The effect of point defects in copper on the anomalous transmission of X-rays

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.

Name thesis:degree_name

Ph.D.

Level thesis:degree_level

Dissertation

Discipline thesis:degree_discipline

Physics

Year dc:date

2011

Author dc:creator

• Edelheit, Lewis Selig

Contributors dc:contributor

• Koehler, James S.

• point defects
• copper
• anomalous x-ray transmission
• Borrmann measurements

Statement dc:rights

• 1970 Lewis Selig Edelheit

Language dc:language

en

Identifier

6065082

OAI identifier oai:identifier

oai:www.ideals.illinois.edu:2142/25806