FS-TUX

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2019-04-02
16:16
[PUBDB-2019-01830] Journal Article

X-ray Raman scattering: a building block for nonlinear spectroscopy
Ultraintense X-ray free-electron laser pulses of attosecond duration can enable new nonlinear X-ray spectroscopic techniques to observe coherent electronic motion. The simplest nonlinear X-ray spectroscopic concept is based on stimulated electronic X-ray Raman scattering. [...]
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ddc:510
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2019-01-30
15:23
OpenAccess [PUBDB-2019-00875] Journal Article
et al
Roadmap of ultrafast x-ray atomic and molecular physics
X-ray free-electron lasers (XFELs) and table-top sources of x-rays based upon high harmonic generation (HHG) have revolutionized the field of ultrafast x-ray atomic and molecular physics, largely due to an explosive growth in capabilities in the past decade. XFELs now provide unprecedented intensity (1020 W cm−2) of x-rays at wavelengths down to ~1 Ångstrom, and HHG provides unprecedented time resolution (~50 attoseconds) and a correspondingly large coherent bandwidth at longer wavelengths [...]
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ddc:530
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2019-01-30
15:18
OpenAccess [PUBDB-2019-00874] Journal Article
et al
Stimulated X-Ray Emission Spectroscopy in Transition Metal Complexes
We report the observation and analysis of the gain curve of amplified $Kα$ x-ray emission from solutions of Mn(II) and Mn(VII) complexes using an x-ray free electron laser to create the $1s$ core-hole population inversion. We find spectra at amplification levels extending over 4 orders of magnitude until saturation [...]
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ddc:530
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2019-01-30
15:06
OpenAccess [PUBDB-2019-00873] Journal Article

Stimulated resonant inelastic x-ray scattering with chirped, broadband pulses
We present an approach for initiating and tracing ultrafast electron dynamics in core-excited atoms, molecules, and solids. The approach is based on stimulated resonant inelastic x-ray scattering induced by a single, chirped, broadband XUV or x-ray pulse [...]
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ddc:530
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2019-01-30
14:44
OpenAccess [PUBDB-2019-00872] Journal Article

Quantum theory of superfluorescence based on two-point correlation functions
Irradiation of a medium by short intense pulses from x-ray (XUV) free-electron lasers can result in saturated photoionization of inner electronic shells. As a result an inversion of populations between core levels appears [...]
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ddc:530
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