SPM

The Munich scanning positron microscope permits positron lifetime measurements with a lateral resolution in the μm range and within an energy range of 1 – 20 keV. Thus, this instrument enables the measurement of high resolved 3D defect maps. Until today, the SPM was operated only in the laboratory at the Universität der Bundeswehr in Munich and was therefore limited by the long measurement times of several days per 2D-scan due to the low intensity of the positron beam produced by a standard ²²Na source. This disadvantage will be overcome by installing the SPM at the high intensity positron beam at NEPOMUC.

Therefore, the SPM interface was designed and tested successfully [1]. This device converts the continuous beam of NEPOMUC to a high-brightness, pulsed positron beam, which matches the demands of the SPM. A sample chamber was connected to the SPM interface which enables spatially resolved positron lifetime measurements with a lateral resolution in the range of 0.1 mm.

[1] Piochacz, C et al., Physica status solidi / C, 4(10), 4028-4031 (2007).