TY - JOUR
T1 - The source-sample stage of the new two-dimensional angular correlation of annihilation radiation spectrometer at Technische Universität München
AU - Ceeh, Hubert
AU - Weber, Josef Andreas
AU - Leitner, Michael
AU - Böni, Peter
AU - Hugenschmidt, Christoph
N1 - Funding Information:
This project is funded by the Deutsche Forschungsgesellschaft (DFG) within the Transregional Collaborative Research Center TRR 80 “From electronic correlations to functionality.”
PY - 2013/4
Y1 - 2013/4
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=84877286138&partnerID=8YFLogxK
U2 - 10.1063/1.4801454
DO - 10.1063/1.4801454
M3 - Article
AN - SCOPUS:84877286138
SN - 0034-6748
VL - 84
JO - Review of Scientific Instruments
JF - Review of Scientific Instruments
IS - 4
M1 - 043905
ER -