Regensburg 2010 – wissenschaftliches Programm
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KR: Fachverband Kristallographie
KR 3: Poster: Crystallography in Nanoscience
KR 3.4: Poster
Mittwoch, 24. März 2010, 15:00–17:30, Poster A
Generation of hard X-ray radiation using the triboelectric effect — •Maximilian Rühl1, Emanuel Gutmann1, Erik Mehner1, Hartmut Stöcker1, and Dirk C. Meyer2 — 1Nachwuchsgruppe Nanostrukturphysik, Institut für Strukturphysik, TU Dresden, 01069 Dresden — 2Institut für Experimentelle Physik, TU Bergakademie Freiberg, 09596 Freiberg
To meet the demands of upcoming imaging for medical demands and scientific methods for structure investigation, generation of X-rays using miniaturized radiation sources is an interesting field of research. Beside approaches based on the ionizing and electron accellerating properties of high electric fields around pyroelectric crystals also the use of a tribomicroplasma generated in the vicinity of the peeling point of two different polymers is promising [1]. We report on the generation of hard X-ray radiation by crawling various peeling tapes in a medium vacuum. Beside vacuum housing and pumps as instrumentation only an electric motor, two rolls and a metal foil as target material are necessary. The spectral distribution of thus generated X-rays was analyzed using an energy dispersive Si (Li) detector. In dependence of peeling speed, pressure and choice of polymer material electrons with energies high enough to excite characteristic X-ray emission in the hard X-ray region are produced. The results are discussed in terms of theory of triboelectricity [2]. [1] C. G. Camara et al. Correlation between nanosecond X-ray flashes and stick-slip friction in peeling tape, Nature 455 (2008) 1089-1092 [2] P. A. Thießen, K. Meyer, G. Heinicke, Grundlagen der Tribochemie (1967) Akademie-Verlag, Berlin