2012/10/12 by Hubert Ceeh, Ceeh, Hubert, Josef-Andreas Weber +8
Chemistry · Earth and Planetary Sciences · Environmental Science · Physics and Astronomy · #Atmospheric Ozone and Climate #Atmospheric and Environmental Gas Dynamics #FOS: Physical sciences #Instrumentation and Detectors (physics.ins-det) #Nuclear Experiment (nucl-ex) #Spectroscopy and Laser Applications #nucl-ex #physics.ins-det
paper · pdf · doi:10.48550/arxiv.1210.3497
arxiv created 2012/10/12 · openalex publication_date 2012/10/12 · arxiv updated 2012/10/15 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Angular Correlation of Annihilation Radiation (ACAR) is a well established technique for the investigation of the electric structure. A major limitation of ACAR studies is the available positron flux at a small spot on the sample. Fore this reason, the focus of this work is put on the discussion of a newly developed source-sample stage which uses an optimized static magnetic field configuration to guide the positrons onto the sample. The achieved spot size is dFWHM=5.4 mm, with a high efficiency over the whole energy spectrum of the 22Na positron source. The implications of the performance of the source-sample stage are discussed with regard to 2D-ACAR measurements of single crystalline α-quartz, which serves as a model system for the determination of the total resolution.