Regensburg 2016 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 71: Scanning Probe Techniques and New Experimental Methods
O 71.18: Poster
Mittwoch, 9. März 2016, 18:15–20:30, Poster A
VUV photon detection with acetone counters for inverse photoemission — •Christian Thiede, Iris Niehues, Anke B. Schmidt, and Markus Donath — Physikalisches Institut, Universität Münster
Inverse photoemission experiments in the isochromat mode require the use of band-pass photon detectors. The bandpass behavior is usually realized by combining the photoionization threshold of a suitable counting gas (high pass) with the transmission characteristics of an alkaline earth fluoride window (low pass). Since inverse photoemission intrinsically suffers from a low photon yield, an optimized detector efficiency is crucial for this technique. In particular, the bandpass width and the efficiency depend on the transmission characteristics of the entrance window [1], the detection gas type and pressure, the readout electronics and the counter geometry. We studied these parameters for the well-known combination of CaF2/acetone. We provide a recipe how to operate the detector in proportional as well as in Geiger-Müller mode. [1] Thiede et al., Rev. Sci. Instrum. 86, 085101 (2015)