TY - JOUR
T1 - Dynamics of Above-Threshold Ionization and Laser-Assisted Electron Scattering inside Helium Nanodroplets
AU - Treiber, Leonhard
AU - Kanya, Reika
AU - Kitzler-Zeiler, Markus
AU - Koch, Markus
N1 - Funding Information:
We gratefully acknowledge funding by the Austrian Science Fund (FWF) under Grants No. P 33166 and I 5590-N, as well as support from NAWI Graz. This work was in part supported by JST, PRESTO Grant Number JPMJPR2007, Japan.
Funding Information:
Open Access is funded by the Austrian Science Fund (FWF).
Publisher Copyright:
© 2022 American Chemical Society. All rights reserved.
PY - 2022/11/17
Y1 - 2022/11/17
N2 - 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.
AB - 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.
UR - http://www.scopus.com/inward/record.url?scp=85141624095&partnerID=8YFLogxK
U2 - 10.1021/acs.jpca.2c05410
DO - 10.1021/acs.jpca.2c05410
M3 - Article
C2 - 36384271
AN - SCOPUS:85141624095
VL - 126
SP - 8380
EP - 8387
JO - The Journal of Physical Chemistry A
JF - The Journal of Physical Chemistry A
SN - 1089-5639
IS - 45
ER -