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Single-shot MHz velocity-map-imaging using two Timepix3 cameras

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arxiv 2111.14407 v1 pith:GKH5JJX4 submitted 2021-11-29 physics.ins-det physics.atm-clus

Hubertus Bromberger , Christopher Passow , David Pennicard , Rebecca Boll , Jonathan Correa , Lanhai He , Melby Johny , Christina Papadopoulou
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Atia Tul-Noor Joss Wiese Sebastian Trippel Benjamin Erk Jochen Küpper
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classification physics.ins-detphysics.atm-clus
keywords resolutionburstscamerademonstrateflashhighmeasuredphotoelectrons
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abstract

We demonstrate the application of event-driven Timepix3-based detectors in combination with a double-sided velocity-map-imaging spectrometer to record the full 3D momentum of charged particles at the free-electron-laser facility FLASH. We measured the XUV induced fragmentation of $\text{N}_2$ using 250 kHz FLASH bursts with sub-pixel spatial resolution and up to 1.7~ns temporal resolution for photoelectrons. To further demonstrate the capabilities of this camera at even higher repetition rates we measured single-shot images of He($1s$) photoelectrons for bursts with a repetition rate of 1 MHz. Overall, with the Timepix3 camera we overcome limitations of standard-camera technology for advanced-imaging experiments with requirements on high event-rates and high spatio-temporal resolution.

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  1. Rotational-state-controlled dissociative ionization dynamics in $\mathrm{CF_2I_2}$

    physics.chem-ph 2026-08 conditional novelty 6.0 of 10

    The initial rotational state of CF2I2 molecules, selected by electrostatic deflection, strongly changes the branching of strong-field dissociative ionization products.

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