Photoelectron angular distributions from strong-field coherent electronic excitation

Wollenhaupt, M.; Krug, M.; Köhler, Jens; Bayer, Tim; Sarpe-Tudoran, C.; Baumert, Thomas

doi:10.1007/s00340-009-3431-1

Cited by 68 publications

(78 citation statements)

References 65 publications

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“…(In this connection, see [45] for the control of the resonant two-color two-photon excitation yield and [46] for the control of the photoelectron angular distributions of the nonperturbative resonant multi-photon ionization with ultrashort polarization-shaped pulses. See also a very recent review article for photoelectron angular distributions [47].…”

Section: Introductionmentioning

confidence: 99%

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Ishikawa

Ueda

2013

Applied Sciences

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We theoretically study the photoelectron angular distribution (PAD) from the two-photon single ionization of H and He by femtosecond and attosecond extreme-ultraviolet pulses, based on the time-dependent perturbation theory and simulations with the full time-dependent Schrödinger equation. The PAD is formed by the interference of the s and d continuum wave packets, and, thus, contains the information on the relative phase δ and amplitude ratio between them. We find that, when a spectrally broadened femtosecond pulse is resonant with an excited level, the PAD substantially changes with pulse width, since the competition between resonant and nonresonant ionization paths, leading to δ distinct from the scattering phase shift difference, changes with it. In contrast, when the Rydberg manifold is excited, and for the case of above-threshold two-photon ionization, δ and the PAD do not depend much on pulse width, except for the attosecond region. Thus, the Rydberg manifold and the continuum behave similarly in this respect. For a high-harmonic pulse composed of multiple harmonic orders, while the value of δ is different from that for a single-component pulse, the PAD still rapidly varies with pulse width. The present results illustrate a new way to tailor the continuum wave packet.

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Section: Introductionmentioning

confidence: 99%

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Ishikawa

Ueda

2013

Applied Sciences

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“…This situation presents a contrast to the case of the photoionization from excited p states [31,32], where the non-resonant path is absent and, as a result, ∆ = ∆ sc . Although the competition has been implicitly used in coherent control of resonance-enhanced multi-photon processes (see, e.g., [20,21]), intermediate levels other than the resonant level are neglected in most cases. In the present study, on the other hand, the contribution from non-resonant intermediate levels is essential to account for ∆ ex [33], which explains why ∆ ex is larger for a higher photon energy, i.e., for smaller level spacing.…”

mentioning

confidence: 99%

Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

Motomura

Ishikawa

et al. 2013

J. Phys. B: At. Mol. Opt. Phys.

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Phase-shift differences and amplitude ratios of the outgoing s and d continuum wave packets generated by two-photon ionization of helium atoms are determined from the photoelectron angular distributions obtained using velocity map imaging. Helium atoms are ionized with ultrashort extreme-ultraviolet free-electron laser pulses with a photon energy of 20.3, 21.3, 23.0, and 24.3 eV, produced by the SPring-8 Compact SASE Source test accelerator. The measured values of the phase-shift differences are distinct from scattering phase-shift differences when the photon energy is tuned to an excited level or Rydberg manifold. The difference stems from the competition between resonant and non-resonant paths in two-photon ionization by ultrashort pulses. Since the competition can be controlled in principle by the pulse shape, the present results illustrate a new way to tailor the continuum wave packet.

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“…[15] is a specific example.) Pulse trains have been used for coherent control of a diverse array of processes, such as photoelectron angular distributions [16,17], magnetization [18], and molecular vibration and rotation [19]. At the same time, they have appeared in optimal-pulse solutions in control experiments * dbfoote@umd.edu † wth@umd.edu [15,[20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Ionization enhancement and suppression by phase-locked ultrafast pulse pairs

Foote

Lin

et al. 2017

Phys. Rev. A

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We present the results of a study of ionization of Xe atoms by a pair of phase-locked pulses, which is characterized by interference produced by the twin peaks. Two types of interference are considered: ordinary optical interference, which changes the intensity of the composite pulse and thus the ion yield, and a quantum interference, in which the excited electron wave packets interfere. We use the measured Xe + yield as a function of the temporal delay and/or relative phase between the peaks to monitor the interferences and compare their relative strengths. We model the interference with a pulse intensity function and by calculating the ionization yield with the time-dependent Schrödinger equation. Our results provide insight into optimal control pulses generated with learning algorithms. The results also show that the relative phase between peaks of a control pulse, along with small features such as distortions and imperfections in the wings of an ideal shape, play a significant role in the control process.

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Photoelectron angular distributions from strong-field coherent electronic excitation

Cited by 68 publications

References 65 publications

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Photoelectron Angular Distribution and Phase in Two-Photon Single Ionization of H and He by a Femtosecond and Attosecond Extreme-Ultraviolet Pulse

Photoelectron angular distributions for the two-photon ionization of helium by ultrashort extreme ultraviolet free-electron laser pulses

Ionization enhancement and suppression by phase-locked ultrafast pulse pairs

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