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MO: Fachverband Molekülphysik
MO 7: Experimental Techniques
MO 7.2: Vortrag
Montag, 11. März 2019, 14:15–14:30, S HS 002 Biologie
Modeling the response of piezoelectric sensors used for detecting pulsed supersonic beams — •Paul Saftien1, Karsten Lange2, and Wolfgang Christen1 — 1Humboldt-Universität zu Berlin, Institut für Chemie, Brook-Taylor-Str. 2, 12489 Berlin, http://clusterlab.de — 2SLT Sensor- und Lasertechnik GmbH, Freiheitstr. 124-126, 15745 Wildau
In our studies [1] a piezoelectric polyvinylidene fluoride (PVDF) foil is used for the detection of pulsed supersonic beams [2]. Benefits of this method are a fast detector response, a ruggedized setup and the fact that no ionization is required. Experimental results performed in a wide range of source conditions (source pressures between 3 bar and 20 bar, source temperatures between -40 ∘C and 70 ∘C) show that the detector response is proportional to the momentum flux of scattered particles. A simultaneous measurement and evaluation of the background pressure in the vacuum chamber allows a calibration of the detector to the amount of atoms per pulse. The evaluation of the signal can be performed either numerically or analytically with a model function considering the electrical and mechanical properties of the piezoelectric detector.
[1] P. Saftien, K. Lange, W. Christen, to be submitted.
[2] Z. Phys. Chem. 228(4-5), 369 (2014), J. Chem. Phys. 139(15), 154202 (2013), J. Chem. Phys. 139(2), 024202 (2013).