In-situ (C)DBS at high temperatures at the NEPOMUC positron beam line

16th International Conference on Positron Annihilation

Reiner, Markus^1 ; Pikart, Philip^1 ; Hugenschmidt, Christoph^1

Technische Universität München, Physik-Department E21 and FRM-II, Lichtenbergstraße 1, D-85748, Germany^1

关键词: Current status;    Depth dependents;    High temperature;    NEPOMUC;    Positron beams;    Positron diffusion;    Sample heating;    Temperature dependence;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/443/1/012071/pdf
DOI  :  10.1088/1742-6596/443/1/012071

来源: IOP

【 摘 要 】

We report on the current status of the sample heating stage in the CDB-spectrometer at the NEPOMUC positron beam line. The currently installed new sample heating is described in detail and various design aspects are discussed briefly. As an exemplary application, the positron diffusion at high temperatures in Ge was investigated by a depth dependent evaluation of both the Doppler broadening of the annihilation line and free Ps annihilation at the surface. It was confirmed that the temperature dependence of the positron diffusion is extraordinarily strong above 670 K.