The source-sample stage of the new two-dimensional angular correlation of annihilation radiation spectrometer at Technische Universität München

Hubert Ceeh, Josef Andreas Weber, Michael Leitner, Peter Böni, Christoph Hugenschmidt

Research output: Contribution to journalArticlepeer-review

11 Scopus citations

Abstract

Angular correlation of annihilation radiation (ACAR) is a well established technique for the investigation of the electronic structure. A major limitation of ACAR studies is the available positron flux at a small spot on the sample. For this reason, the focus of this work is put on the discussion of a newly developed source-sample stage of the new 2D-ACAR spectrometer at Technische Universität München which uses an optimized static magnetic field configuration to guide the positrons onto the sample. The achieved spot diameter 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. A value of (1.53 × 1.64) mrad2 FWHM was achieved at room temperature.

Original languageEnglish
Article number043905
JournalReview of Scientific Instruments
Volume84
Issue number4
DOIs
StatePublished - Apr 2013

Fingerprint

Dive into the research topics of 'The source-sample stage of the new two-dimensional angular correlation of annihilation radiation spectrometer at Technische Universität München'. Together they form a unique fingerprint.

Cite this