Coherence and correlations in photoinduced Auger and fluorescence cascades in atoms

Kabachnik, N. M.; Fritzsche, S.; Grum-Grzhimailo, A N; Meyer, Michael; Ueda, Kiyoshi

doi:10.1016/j.physrep.2007.07.005

Cited by 90 publications

(56 citation statements)

References 318 publications

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“…Also these processes have been used in a variety of applications in laser optics and spectroscopy. It is well known that the two-photon photoelectron angular distributions (PAD) are directly related to the relative amplitudes and the relative phase between different partial waves [8,[12][13][14][15][16]. However, these earlier works dealt with the laser pulses in the optical range whose pulse width is very long in comparison with the modern standard of femosecond laser technology.…”

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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“…Accordingly, CD in photoemission from solids has been widely used for the investigation of local magnetization and other properties of solids and surfaces (for example, refs 10,11). In atomic and molecular physics, circularly polarized photon beams have been applied for example in studies of electron spin-related phenomena and its polarization control 12,13 as well as of symmetry breaking in chiral molecules 14,15 . With FERMI many experimental techniques, already well established for applications of CD using synchrotron radiation, high order harmonics or optical lasers [16][17][18][19][20][21] , can now be extended to studies at FEL sources.…”

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confidence: 99%

Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism

et al. 2014

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Ultrafast extreme ultraviolet and X-ray free-electron lasers are set to revolutionize many domains such as bio-photonics and materials science, in a manner similar to optical lasers over the past two decades. Although their number will grow steadily over the coming decade, their complete characterization remains an elusive goal. This represents a significant barrier to their wider adoption and hence to the full realization of their potential in modern photon sciences. Although a great deal of progress has been made on temporal characterization and wavefront measurements at ultrahigh extreme ultraviolet and X-ray intensities, only few, if any progress on accurately measuring other key parameters such as the state of polarization has emerged. Here we show that by combining ultra-short extreme ultraviolet free electron laser pulses from FERMI with near-infrared laser pulses, we can accurately measure the polarization state of a free electron laser beam in an elegant, non-invasive and straightforward manner using circular dichroism.

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“…However, this is not the case experimentally. In addition to the well-known relativistic or non-relativistic (anisotropic) electron-ion or configuration interactions extensively discussed for atoms [13,14], the origin of the present observation is a molecular effect. The emitted electrons are scattered by the surrounding atoms, which affects their angular distribution and allows some of them to reach the detector.…”

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confidence: 69%

Laboratory-frame electron angular distributions: Probing the chemical environment through intramolecular electron scattering

et al. 2013

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PostprintThis is the accepted version of a paper published in Physical Review A. Atomic, Molecular, and Optical Physics. This paper has been peer-reviewed but does not include the final publisher proof-corrections or journal pagination. AbstractCarbon 1s photoelectron asymmetry parameters β for the chlorinated and the methyl carbon atom of CH 3 CH 2 Cl, CH 3 CHCl 2 , and CH 3 CCl 3 have been measured using synchrotron radiation in the 340-600 eV energy range. We provide experimental evidence that the intramolecular scattering strongly affects β values, even far from the ionization threshold. The results are in agreement with B-spline DFT calculations, making it possible to single out the behavior of the various continuum partial waves. We conclude that the intramolecular scattering makes electron angular distributions a sensitive probe of the chemical environment, even in isolated gas phase molecules.

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Coherence and correlations in photoinduced Auger and fluorescence cascades in atoms

Cited by 90 publications

References 318 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

Determining the polarization state of an extreme ultraviolet free-electron laser beam using atomic circular dichroism

Laboratory-frame electron angular distributions: Probing the chemical environment through intramolecular electron scattering

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