TY - JOUR
T1 - Population transfer to high angular momentum states in infrared-assisted XUV photoionization of helium
AU - Mayer, Nicola
AU - Peng, Peng
AU - Villeneuve, David M.
AU - Patchkovskii, Serguei
AU - Ivanov, Misha
AU - Kornilov, Oleg
AU - Vrakking, Marc J.J.
AU - Niikura, Hiromichi
N1 - Funding Information:
Original content from this work may be used under the terms of the . Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI. US Air Force Office of Scientific Research FA9550-16-1-0109 Japan Society for the Promotion of Science https://doi.org/10.13039/501100001691 18H03903 Natural Sciences and Engineering Research Council of Canada https://doi.org/10.13039/501100000038 DFG QUTIF IV 152/6-2 yes � 2020 The Author(s). Published by IOP Publishing Ltd Creative Commons Attribution 4.0 licence
Publisher Copyright:
© 2020 The Author(s). Published by IOP Publishing Ltd.
PY - 2020/8/28
Y1 - 2020/8/28
N2 - An extreme-ultraviolet (XUV) laser pulse consisting of harmonics of a fundamental near-infrared (NIR) laser frequency is combined with the NIR pulse to systematically study two-color photoionization of helium atoms. A time-resolved photoelectron spectroscopy experiment is carried out where energy- A nd angle-resolved photoelectron distributions are obtained as a function of the NIR intensity and wavelength. Time-dependent Schrödinger equation calculations are performed for the conditions corresponding to the experiment and used to extract residual populations of Rydberg states resulting from excitation by the XUV + NIR pulse pair. The residual populations are studied as a function of the NIR intensity (3.5 × 1010-8 × 1012 W cm-2) and wavelength (760-820 nm). The evolution of the photoelectron distribution and the residual populations are interpreted using an effective restricted basis model, which includes the minimum set of states relevant to the features observed in the experiments. As a result, a comprehensive and intuitive picture of the laser-induced dynamics in helium atoms exposed to a two-color XUV-NIR light field is obtained.
AB - An extreme-ultraviolet (XUV) laser pulse consisting of harmonics of a fundamental near-infrared (NIR) laser frequency is combined with the NIR pulse to systematically study two-color photoionization of helium atoms. A time-resolved photoelectron spectroscopy experiment is carried out where energy- A nd angle-resolved photoelectron distributions are obtained as a function of the NIR intensity and wavelength. Time-dependent Schrödinger equation calculations are performed for the conditions corresponding to the experiment and used to extract residual populations of Rydberg states resulting from excitation by the XUV + NIR pulse pair. The residual populations are studied as a function of the NIR intensity (3.5 × 1010-8 × 1012 W cm-2) and wavelength (760-820 nm). The evolution of the photoelectron distribution and the residual populations are interpreted using an effective restricted basis model, which includes the minimum set of states relevant to the features observed in the experiments. As a result, a comprehensive and intuitive picture of the laser-induced dynamics in helium atoms exposed to a two-color XUV-NIR light field is obtained.
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U2 - 10.1088/1361-6455/ab9495
DO - 10.1088/1361-6455/ab9495
M3 - Article
AN - SCOPUS:85089384513
VL - 53
JO - Journal of Physics B: Atomic, Molecular and Optical Physics
JF - Journal of Physics B: Atomic, Molecular and Optical Physics
SN - 0953-4075
IS - 16
M1 - 164003
ER -