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Mapping the direction of electron ionization to phase delay between VUV and IR laser pulses

Mountney, M; Katsoulis, GP; Møller, SH; Jana, K; Corkum, P; Emmanouilidou, A; (2022) Mapping the direction of electron ionization to phase delay between VUV and IR laser pulses. Physical Review A , 106 (4) , Article 043106. 10.1103/physreva.106.043106. Green open access

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Abstract

We theoretically demonstrate a one-to-one mapping between the direction of electron ionization and the phase delay between a linearly polarized vacuum ultraviolet (VUV) and a circular infrared (IR) laser pulse. To achieve this, we use an ultrashort VUV pulse that defines the moment in time and space when an above-threshold electron is released in the IR pulse. The electron can then be accelerated to high velocities escaping in a direction completely determined by the phase delay between the two pulses. The dipole matrix element to transition from an initial bound state of the N2 molecule, considered in this work, to the continuum is obtained using quantum-mechanical techniques that involve computing accurate continuum molecular states. Following release of the electron in the IR pulse, we evolve classical trajectories, neglecting the Coulomb potential and accounting for quantum interference, to compute the distribution of the direction and magnitude of the final electron momentum. The concept we theoretically develop can be implemented to produce nanoscale ring currents that generate large magnetic fields.

Type: Article
Title: Mapping the direction of electron ionization to phase delay between VUV and IR laser pulses
Open access status: An open access version is available from UCL Discovery
DOI: 10.1103/physreva.106.043106
Publisher version: https://doi.org/10.1103/PhysRevA.106.043106
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
UCL classification: UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10157635
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