Erlangen 2018 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 25: Poster Session I

A 25.8: Poster

Dienstag, 6. März 2018, 16:15–18:15, Redoutensaal

Design of a Thomson Ion Streak Spectrometer for the European-XFEL — Burkhard Langer, Felix Gerke, Egill Antonsson, and •Eckart Rühl — Physikalische Chemie, Freie Universität Berlin, Takustr. 3, 14195 Berlin

When clusters or nanoparticles are exposed to free-electron-laser (FEL) radiation, Coulomb explosion produces ions that can have kinetic energies of several hundred electron volts. In a conventional time-of-flight mass spectrometer the ion spectrum is smeared out since the flight time blends the charge-to-mass ratio with the kinetic energy of the ions. In our novel design of a Thomson type spectrometer the simultaneous application of a magnetic and an electric field is used to disentangle these properties. Ions of the same charge-to-mass ratio are focused on specific parabolas on the detection screen and the positions along these parabolas depend upon their kinetic energy. For experiments at FEL facilities, such as FLASH and the European-XFEL in Hamburg, that offer an X-ray beam with micro-bunches it is possible to use a fast, stepwise varying extraction field to imprint the micro-bunch time structure to the kinetic energy of the ions. This increases the detection efficiency by using several of the micro-bunches, particularly when the novel spectrometer is used in combination with other time resolved devices.