Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques
MO 14.15: Poster
Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof
ion-ion coincidence imaging using an in-vacuum pixel detector — •jingming long1, federico furch1, judith durá1, anton tremsin2, claus-peter schulz1, arnaud rouzée1, and marc vrakking1 — 1Max Born Institute for Nonlinear Optics and Short Pulses Spectroscopy, Max Born Straβe 2A, 12353, Berlin, Germany — 2Space Sciences Laboratory, University of California at Berkeley, Berkeley CA 94720, USA
The ionization and fragmentation of molecules by intense laser fields has been the subject of intense research for decades. Two main experimental techniques developed to record the momentum distribution of the charged particles generated from strong field ionization are widely used: the velocity map imaging and the 3D coincidence imaging. The full 3D momentum vectors of all participating fragments can be measured in coincidence using a reaction microscope (REMI) or a cold target recoil ion momentum spectrometer (COLTRIMS).
Recently, we have implemented a new in vacuum pixel detector, the so-called Timepix, as a replacement of traditional delay line anodes. This new 3D detector has been tested for ion-ion coincidence experiments showing the possibility to reach sub-pixel spatial resolution (<55 µm) and a 25 ps temporal resolution, at a 1 kHz frame readout rate. Combined with a high repetition rate (400 kHz) laser, our ion-ion coincidence imaging spectrometer can achieve an event rate faster than 104 ion events per second, and can be a powerful tool in studies of ultrafast nuclear dynamics in strong laser fields.