Strong-Field Excitation of Helium: Bound State Distribution and Spin Effects

Zimmermann, H.; Buller, Jakov; Eilzer, Sebastian; Eichmann, U.

doi:10.1103/physrevlett.114.123003

Cited by 63 publications

(32 citation statements)

References 36 publications

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“…However, interference effects are largely smeared out by focal averaging, which restores agreement with the TDSE and the semiclassical calculations in Ref. [22]. It should be noted that this n distribution cannot be explained by the Freeman resonance mechanism.…”

Section: Comparison With Experimentssupporting

confidence: 84%

“…Experiments show that for the He atom the population of the Rydberg states peaks at about n = 9 at I = 1.8 × 10 15 W/cm 2 with a slight tendency to shift to higher n when the intensity increases to I = 2.9 × 10 15 W/cm 2 [22]. For comparison, the focal average of the RSE calculated by our proposed quantum model is shown in Fig.…”

Section: Comparison With Experimentsmentioning

confidence: 97%

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Quantum dynamics of atomic Rydberg excitation in strong laser fields

Hao

et al. 2019

Opt. Express

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Neutral atoms have been observed to survive intense laser pulses in high Rydberg states with surprisingly large probability. Only with this Rydberg-state excitation (RSE) included is the picture of intense-laser-atom interaction complete. Various mechanisms have been proposed to explain the underlying physics. However, neither one can explain all the features observed in experiments and in time-dependent Schrödinger equation (TDSE) simulations. Here we propose a fully quantummechanical model based on the strong-field approximation (SFA). It well reproduces the intensity dependence of RSE obtained by the TDSE, which exhibits a series of modulated peaks. They are due to recapture of the liberated electron and the fact that the pertinent probability strongly depends on the position and the parity of the Rydberg state. We also present measurements of RSE in xenon at 800 nm, which display the peak structure consistent with the calculations.PACS numbers:

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Section: Comparison With Experimentssupporting

confidence: 84%

Section: Comparison With Experimentsmentioning

confidence: 97%

Quantum dynamics of atomic Rydberg excitation in strong laser fields

Hao

et al. 2019

Opt. Express

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“…Spin-dependent motion is implemented in the seminal Stern-Gerlach experiment 1 and variants thereof 2,3 . Effects of spin-dependent forces appear in condensed matter 4 , in astrophysical systems 5 , in quantum plasmas 6,7 , and at relativistic electrons in strong electromagnetic fields [8][9][10][11][12][13] . A consistent theoretical framework for the description of particles with internal angular momentum is provided by the Dirac equation 14 .…”

mentioning

confidence: 99%

Identifying the Stern-Gerlach force of classical electron dynamics

Wen

Bauke

Keitel

2016

Sci Rep

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Different classical theories are commonly applied in various branches of physics to describe the relativistic dynamics of electrons by coupled equations for the orbital motion and spin precession. Exemplarily, we benchmark the Frenkel model and the classical Foldy-Wouthuysen model with spin-dependent forces (Stern-Gerlach forces) to the quantum dynamics as predicted by the Dirac equation. Both classical theories can lead to different or even contradicting predictions how the Stern-Gerlach forces modify the electron’s orbital motion, when the electron moves in strong electromagnetic field configurations of emerging high-intensity laser facilities. In this way, one may evaluate the validity and identify the limits of these classical theories via a comparison with possible experiments to provide a proper description of spin-induced dynamics. Our results indicate that the Foldy-Wouthuysen model is qualitatively in better agreement with the Dirac theory than the widely used Frenkel model.

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“…For measuring the metastable state population the secondary emission from an upper selectively excited state can be detected. Another method of the excited atoms detection is described in [57,58]. The method demonstrates very high sensitivity, namely even singe excited atoms can be detected.…”

Section: Discussionmentioning

confidence: 99%

Method of XUV attosecond pulse characterization using two-photon resonant Raman-type transition

2018

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We suggest a new method of attosecond pulse train measurement based on two-photon Raman-type resonant interaction of the XUV with an atom (Attosecond pulse reconstruction using Raman-type Transitions, ART). We show analytically and numerically that the attosecond pulse auto-correlation function and chirp can be measured using this process. Its resonant nature allows obtaining reasonable signal even for relatively low XUV intensity. The interpretation of the results is remarkably simple for the XUV generated by bi-circular field. The experimental realization of the method can be based either on measuring the excitation of the gas or on four-wave mixing fully optical scheme.We suppose that the parity of the states is such that a two-photon transition from the ground to the excited state is allowed. Transitions to other bound states are assumed to be non-resonant and so they can be neglected.

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Strong-Field Excitation of Helium: Bound State Distribution and Spin Effects

Cited by 63 publications

References 36 publications

Quantum dynamics of atomic Rydberg excitation in strong laser fields

Quantum dynamics of atomic Rydberg excitation in strong laser fields

Identifying the Stern-Gerlach force of classical electron dynamics

Method of XUV attosecond pulse characterization using two-photon resonant Raman-type transition

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