FS-CFEL-3

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2017-04-25
12:23
OpenAccess [PUBDB-2017-01875] Journal Article
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Laser control over the ultrafast Coulomb explosion of N$_{2}$$^{2+}$ after Auger decay: A quantum-dynamics investigation
ddc:530
By theoretical calculation, we demonstrate the possibility to control and partially suppress the Coulomb explosion of N$_2$ molecules after core-level photoionization by an x-ray laser and subsequent Auger decay. This is achieved by means of a femtosecond infrared laser pulse interacting with the N$_{2}$$^{2+}$ dication produced by the x-ray pulse [...]
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2017-04-18
09:40
OpenAccess [PUBDB-2017-01674] Journal Article
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Interplay between relativistic energy corrections and resonant excitations in x-ray multiphoton ionization dynamics of Xe atoms
ddc:530
In this paper, we theoretically study x-ray multiphoton ionization dynamics of heavy atoms taking into account relativistic and resonance effects. When an atom is exposed to an intense x-ray pulse generated by an x-ray free-electron laser (XFEL), it is ionized to a highly charged ion via a sequence of single-photon ionization and accompanying relaxation processes, and its final charge state is limited by the last ionic state that can be ionized by a single-photon ionization [...]
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2017-03-28
12:37
OpenAccess [PUBDB-2017-01478] Journal Article
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Electronic decoherence following photoionization: Full quantum-dynamical treatment of the influence of nuclear motion
ddc:530
Photoionization using attosecond pulses can lead to the formation of coherent superpositions of the electronic states of the parent ion. However, ultrafast electron ejection triggers not only electronic but also nuclear dynamics—leading to electronic decoherence, which is typically neglected on time scales up to tens of femtoseconds [...]
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2017-03-02
12:30
[PUBDB-2017-01255] Journal Article
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Compton spectra of atoms at high x-ray intensity
ddc:530
Compton scattering is the nonresonant inelastic scattering of an x-ray photon by an electron and has been used to probe the electron momentum distribution in gas-phase and condensed-matter samples. In the low x-ray intensity regime, Compton scattering from atoms dominantly comes from bound electrons in neutral atoms, neglecting contributions from bound electrons in ions and free (ionized) electrons. [...]
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2017-02-07
08:59
[PUBDB-2017-00884] Journal Article
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State-resolved attosecond reversible and irreversible dynamics in strong optical fields
ddc:530
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2017-02-07
08:28
Embargoed OpenAccess [PUBDB-2017-00883] Journal Article
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Finite-temperature second-order many-body perturbation theory revisited
ddc:540
We present an algebraic, nondiagrammatic derivation of finite-temperature second-order many-body perturbation theory [FT-MBPT(2)], using techniques and concepts accessible to theoretical chemical physicists. We give explicit expressions not just for the grand potential but particularly for the mean energy of an interacting many-electron system. [...]
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2017-02-02
08:24
OpenAccess [PUBDB-2017-00832] Journal Article
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Electron-ion coupling in semiconductors beyond Fermi's golden rule
ddc:530
In the present work, a theoretical study of electron-phonon (electron-ion) coupling rates in semiconductors driven out of equilibrium is performed. Transient change of optical coefficients reflects the band gap shrinkage in covalently bonded materials, and thus, the heating of atomic lattice. [...]
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2017-01-27
09:16
OpenAccess [PUBDB-2017-00784] Journal Article
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Time-dependent configuration-interaction-singles calculation of the 5 $p$-subshell two-photon ionization cross section in xenon
ddc:530
The 5p two-photon ionization cross section of xenon in the photon-energy range below the one-photon ionization threshold is calculated within the time-dependent configuration-interaction-singles (TDCIS) method. The TDCIS calculations are compared to random-phase-approximation calculations [Wendin et al., J. [...]
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2017-01-06
15:55
[PUBDB-2017-00237] Journal Article
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Corrigendum: Time-resolved electron kinetics in swift heavy ion irradiated solids
ddc:530
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2017-01-05
12:32
[PUBDB-2017-00169] Journal Article
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Ultrafast electron diffraction imaging of bond breaking in di-ionized acetylene
Science 354(6310), 308 - 312 (2016) [10.1126/science.aah3429]  GO
ddc:500
Visualizing chemical reactions as they occur requires atomic spatial and femtosecond temporal resolution. Here, we report imaging of the molecular structure of acetylene (C$_2$H$_2$) 9 femtoseconds after ionization. [...]
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