Dynamics of Above-Threshold Ionization and Laser-Assisted Electron Scattering inside Helium Nanodroplets

Leonhard Treiber, Reika Kanya, Markus Kitzler-Zeiler, Markus Koch*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Laser-assisted electron scattering (LAES) is a fundamental three body interaction process that enables energy transfer between electrons and photons in the presence of matter. Here, we focus on the multiscattering regime of electrons generated by above-threshold ionization (ATI) of In atoms inside a high-density nanostructure, helium nanodroplets (HeN) of ∼40 Å radius. The stochastic nature of the multiscattering regime results in photoelectron spectra independent of laser polarization. Numerical simulations via tunnel-type ionization followed by applying the Kroll-Watson approximation for LAES are in agreement with experimental spectra and yield a mechanistic description of electron generation and the LAES energy modulation processes. We find a negligible influence of the electron start position inside the helium droplet on the simulated electron energy spectrum. Further, our simulations shine light on the interplay of electron time of birth, number of LAES gain/loss events, and final kinetic energy; early ionization leads to the largest number of scattering events and thereby the highest electron kinetic energy.

Original languageEnglish
Pages (from-to)8380-8387
Number of pages8
JournalJournal of Physical Chemistry A
Issue number45
Publication statusPublished - 17 Nov 2022

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry


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