The Soft X-ray Research instrument at the Linac Coherent Light Source

Dakovski, Georgi L.; Heimann, Philip; Holmes, Michael; Krupin, O.; Minitti, Michael P.; Mitra, A.; Moeller, Stefan; Rowen, M.; Schlotter, W. F.; Turner, Joshua J.

doi:10.1107/s160057751500301x

Cited by 34 publications

(22 citation statements)

References 18 publications

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“…Experiment was performed at the linac coherent light source (LCLS) soft x-ray materials science (SXR) instrument [42,43] with the liquid jet endsation [44]. The 1 mol l −1 Fe(CO) 5 ethanol solution was photo-excited at 266 nm (4.66 eV).…”

Section: Methodsmentioning

confidence: 99%

Anti-Stokes resonant x-ray Raman scattering for atom specific and excited state selective dynamics

et al. 2016

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Ultrafast electronic and structural dynamics of matter govern rate and selectivity of chemical reactions, as well as phase transitions and efficient switching in functional materials. Since x-rays determine electronic and structural properties with elemental, chemical, orbital and magnetic selectivity, short pulse x-ray sources have become central enablers of ultrafast science. Despite of these strengths, ultrafast x-rays have been poor at picking up excited state moieties from the unexcited ones. With time-resolved anti-Stokes resonant x-ray Raman scattering (AS-RXRS) performed at the LCLS, and ab initio theory we establish background free excited state selectivity in addition to the elemental, chemical, orbital and magnetic selectivity of x-rays. This unparalleled selectivity extracts low concentration excited state species along the pathway of photo induced ligand exchange of Fe(CO) 5 in ethanol. Conceptually a full theoretical treatment of all accessible insights to excited state dynamics with AS-RXRS with transform-limited x-ray pulses is given-which will be covered experimentally by upcoming transform-limited x-ray sources.With the rapid evolution of sub-picosecond and femtosecond x-ray sources and particularly with the emergence x-ray free-electron lasers, first steps to join the unique electronic structure information of x-ray spectroscopy with the ultrafast time scale of dynamics in matter have been taken [1][2][3][4][5][6][7][8]. Often though, time resolved x-ray spectroscopy at these dilute transient species with x-ray absorption, x-ray fluorescence or electron spectroscopy suffer often from the difficult separation between the overlapping spectral signatures of the dilute excited state species and the ground state. To reach improved chemical selectivity with x-ray lasers nonlinear and OPEN ACCESS RECEIVED

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Section: Methodsmentioning

confidence: 99%

Anti-Stokes resonant x-ray Raman scattering for atom specific and excited state selective dynamics

et al. 2016

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“…Data collection of the partial fluorescence yield (PFY) measurements were performed at the SXR instrument at the LCLS [29][30][31][32][33]35] as described by Mitzner et al in [24]. A schematic drawing of the set up including the self-seeding scheme of the FEL is depicted in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…Soft x-ray L-and K-edge XAS in the 250-1000 eV range typically require a spectral resolution corresponding to 0.05%, hence the beam has to be passed through a grating monochomator (~20% reflectivity) with a bandwidth-narrowing exit slit, although it has been shown that at ~100 eV experiments without an exit slit can be performed [28]. As a consequence of these and related losses in typical soft x-ray beamlines, the monochromatic peak flux on the sample at the soft x-ray endstation (SXR) of LCLS is reduced to a few percent of the original peak flux depending on the selected resolving power [29][30][31][32][33]. This reduced monochromatic photon flux is a limitation in particular for L-edge absorption spectroscopy of 3d transition metal atoms for dilute samples such as metalloenzymes (~mM) and for more complex techniques that require a particularly high average flux such as inelastic x-ray scattering (RIXS) measurements that hold great potential for quantitative electronic structure analyses [4].…”

Section: Introductionmentioning

confidence: 99%

X-ray absorption spectroscopy using a self-seeded soft X-ray free-electron laser

Kröll¹,

Kern²,

Kubin³

et al. 2016

Opt. Express

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X-ray free electron lasers (XFELs) enable unprecedented new ways to study the electronic structure and dynamics of transition metal systems. L-edge absorption spectroscopy is a powerful technique for such studies and the feasibility of this method at XFELs for solutions and solids has been demonstrated. However, the required x-ray bandwidth is an order of magnitude narrower than that of self-amplified spontaneous emission (SASE), and additional monochromatization is needed. Here we compare L-edge xray absorption spectroscopy (XAS) of a prototypical transition metal system based on monochromatizing the SASE radiation of the linac coherent light source (LCLS) with a new technique based on self-seeding of LCLS. We demonstrate how L-edge XAS can be performed using the self-seeding scheme without the need of an additional beam line monochromator. We show how the spectral shape and pulse energy depend on the undulator setup and how this affects the x-ray spectroscopy measurements.© 2016 Optical Society of America OCIS codes: (340.7480) X-rays, soft x-rays, extreme ultraviolet (EUV); (340.0340) X-ray optics; (300.6560) Spectroscopy, x-ray; (050.2770) Gratings; (000.1570) Chemistry; (000.2190) Experimental physics. Walz, J. Welch, and J. Wu, "Experimental demonstration of a soft x-ray self-seeded free-electron laser," Phys.

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“…The experiment was performed at the Soft X-ray Material Science (SXR) Instrument of the Linac Coherent Light Source (LCLS) [25][26][27]. The x-ray beam in self-amplified spontaneous emission (SASE) mode, which have an energy bandwidth of ~ 0.3 %, was set in the photon energy range between 1480 and 1510 eV, which lies well below the K-edge of aluminum.…”

Section: Introductionmentioning

confidence: 99%