Photoelectron tomography with an intra-cavity velocity-map imaging spectrometer at 100 MHz repetition rate

J-H Oelmann; T Heldt; L Guth; J Nauta; N Lackmann; V Wössner; S Kokh; T Pfeifer; J R Crespo López-Urrutia

doi:10.1063/5.0104679

Photoelectron tomography with an intra-cavity velocity-map imaging spectrometer at 100 MHz repetition rate

Rev Sci Instrum. 2022 Dec 1;93(12):123303. doi: 10.1063/5.0104679.

Authors

J-H Oelmann¹, T Heldt¹, L Guth¹, J Nauta¹, N Lackmann¹, V Wössner¹, S Kokh¹, T Pfeifer¹, J R Crespo López-Urrutia¹

Affiliation

¹ Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany.

PMID: 36586896
DOI: 10.1063/5.0104679

Abstract

We present a compact velocity-map imaging (VMI) spectrometer for photoelectron imaging at 100 MHz repetition rate. Ultrashort pulses from a near-infrared frequency comb laser are amplified in a polarization-insensitive passive femtosecond enhancement cavity. In the focus, multi-photon ionization (MPI) of gas-phase atoms is studied tomographically by rotating the laser polarization. We demonstrate the functioning of the VMI spectrometer by reconstructing photoelectron angular momentum distributions from xenon MPI. Our intra-cavity VMI setup collects electron energy spectra at high rates, with the advantage of transferring the coherence of the cavity-stabilized femtosecond pulses to the electrons. In addition, the setup will allow studies of strong-field effects in nanometric tips.