Observation of laser-assisted electron scattering in superfluid helium

Treiber, Leonhard; Thaler, Bernhard; Heim, Pascal; Stadlhofer, Michael; Kitzler-Zeiler, Markus; Koch, Markus

doi:10.21203/rs.3.rs-151146/v1

Cited by 3 publications

(3 citation statements)

References 29 publications

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“…Furthermore, by applying methods based on angular streaking developed previously [9,13,14] and with the support from semiclassical trajectory simulations we are able to show that the dominant process underlying the rotation is scattering of the second-emitted electron on the neighboring molecular ion as it is driven away by the strong laser field. This finding adds to the emerging evidence for the key importance of laser-subcycle electron scattering dynamics in strong-field driven dimers [29] and clusters [33].…”

Section: Introductionsupporting

confidence: 62%

Exploring photoelectron angular distributions emitted from molecular dimers by two delayed intense laser pulses

et al. 2020

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We describe the results of experiments and simulations performed with the aim of extending photoelectron spectroscopy with intense laser pulses to the case of molecular compounds. Dimer frame photoelectron angular distributions generated by double ionization of N 2 -N 2 and N 2 -O 2 van der Waals dimers with ultrashort, intense laser pulses are measured using four-body coincidence imaging with a reaction microscope. To study the influence of the first-generated molecular ion on the ionization behavior of the remaining neutral molecule we employ a two-pulse sequence comprising of a linearly polarized and a delayed elliptically polarized laser pulse that allows distinguishing the two ionization steps. By analysis of the obtained electron momentum distributions we show that scattering of the photoelectron on the neighboring molecular potential leads to a deformation and rotation of the photoelectron angular distribution as compared to that measured for an isolated molecule. Based on this result we demonstrate that the electron momentum space in the dimer case can be separated, allowing us to extract information about the ionization pathway from the photoelectron angular distributions. Our work, when implemented with a variable pulse delay, opens up the possibility of investigating light-induced electronic dynamics in molecular dimers using angularly resolved photoelectron spectroscopy with intense laser pulses.

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Section: Introductionsupporting

confidence: 62%

Exploring photoelectron angular distributions emitted from molecular dimers by two delayed intense laser pulses

et al. 2020

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“…Furthermore, by applying methods based on angular streaking developed previously [9,10,14] and with the support from semi-classical trajectory simulations we are able to show that the dominant process underlying the rotation is scattering of the second-emitted electron on the neighbouring molecular as it is driven away by the strong laser field. This finding adds to the emerging evidence for the key importance of laser-sub-cycle electron scattering dynamics in strong-field driven dimers [29] and clusters [33].…”

Section: Introductionsupporting

confidence: 61%

Exploring photoelectron angular distributions emitted from molecular dimers by two delayed intense laser pulses

Hanus,

Kangaparambil,

Larimian

et al. 2020

Preprint

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We describe the results of experiments and simulations performed with the aim of extending photoelectron spectroscopy with intense laser pulses to the case of molecular compounds. Dimer frame photoelectron angular distributions generated by double ionization of N2-N2 and N2-O2 van der Waals dimers with ultrashort, intense laser pulses are measured using four-body coincidence imaging with a reaction microscope. To study the influence of the first-generated molecular ion on the ionization behavior of the remaining neutral molecule we employ a two-pulse sequence comprising of a linearly polarized and a delayed elliptically polarized laser pulse that allows distinguishing the two ionization steps. By analysis of the obtained electron momentum distributions we show that scattering of the photoelectron on the neighbouring molecular potential leads to a deformation and rotation of the photoelectron angular distribution as compared to that measured for an isolated molecule. Based on this result we demonstrate that the electron momentum space in the dimer case can be separated, allowing to extract information about the ionization pathway from the photoelectron angular distributions. Our work, when implemented with variable pulse delay, opens up the possibility of investigating light-induced electronic dynamics in molecular dimers using angularly resolved photoelectron spectroscopy with intense laser pulses.

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“…51 Under conditions where the electron energies are significantly higher than the photon energy, good agreements are obtained. 52 Note that the Kroll−Watson theory has recently been used under similar conditions 53 and has shown good agreement, although the applicability of this theory to such scenarios has still to be proven. We thus adopt the current knowledge and analyze the change in the distribution of photoelectrons emitted from embedded Mg within a Monte Carlo (MC) simulation.…”

mentioning

confidence: 99%

Phase-of-the-Phase Electron Momentum Spectroscopy on Single Metal Atoms in Helium Nanodroplets

Krebs

Tulsky

Kazak

et al. 2022

J. Phys. Chem. Lett.

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Magnesium atoms fully embedded in helium nanodroplets are exposed to two-color laser pulses, which trigger multiphoton above-threshold ionization (ATI). This allows exemplary study of the contribution of a dense, neutral, and finite medium on single electron propagation. The angular-resolved photoelectron spectra show striking differences with respect to results obtained on free atoms. Scattering of the individual Mg photoelectrons, when traversing the neutral helium environment, causes the angular distribution to become almost isotropic. Furthermore, the appearance of higher-energy electrons is observed, indicating the impact of the droplet on the concerted emission process. Phase-of-the-phase spectroscopy, however, reveals a marked loss in the 2ω–ω phase dependence of the electron signal. Taking into account sideband formation on a quantitative level, a Monte Carlo simulation which includes laser-assisted electron scattering can reproduce the experimental spectra and give insights into the strong-field-induced electron emission from disordered systems.

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Observation of laser-assisted electron scattering in superfluid helium

Cited by 3 publications

References 29 publications

Exploring photoelectron angular distributions emitted from molecular dimers by two delayed intense laser pulses

Exploring photoelectron angular distributions emitted from molecular dimers by two delayed intense laser pulses

Exploring photoelectron angular distributions emitted from molecular dimers by two delayed intense laser pulses

Phase-of-the-Phase Electron Momentum Spectroscopy on Single Metal Atoms in Helium Nanodroplets

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