The Advanced Light Source (ALS) Slicing Undulator Beamline

Heimann, P. A.; Glover, T. E.; Plate, D.; Lee, H. J.; Brown, V. C.; Padmore, H. A.; Schoenlein, R. W.

doi:10.1063/1.2436277

Cited by 16 publications

(16 citation statements)

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“…Copper (I) sulphide nanodisks (10 nm diameter) were observed using ultrafast X-ray pump-probe techniques at beamline 6.0.2 at the Advanced Light Source (ALS) at Lawrence Berkeley National Laboratory 24,25 . Samples were photo-excited with above-band-gap 400 nm light pulses of 50 fs pulse duration.…”

Section: Resultsmentioning

confidence: 99%

The mechanism of ultrafast structural switching in superionic copper (I) sulphide nanocrystals

et al. 2013

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Superionic materials are multi-component solids with simultaneous characteristics of both a solid and a liquid. Above a critical temperature associated with a structural phase transition, they exhibit liquid-like ionic conductivities and dynamic disorder within a rigid crystalline structure. Broad applications as electrochemical storage materials and resistive switching devices follow from this abrupt change in ionic mobility, but the microscopic pathways and speed limits associated with this switching process are largely unknown. Here we use ultrafast X-ray spectroscopy and scattering techniques to obtain an atomic-level, real-time view of the transition state in copper sulphide nanocrystals. We observe the transformation to occur on a twenty picosecond timescale and show that this is determined by the ionic hopping time.

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Section: Resultsmentioning

confidence: 99%

The mechanism of ultrafast structural switching in superionic copper (I) sulphide nanocrystals

et al. 2013

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“…The facility incorporates a high-repetition-rate Ti:sapphire laser system that can produce frequency-converted excitation pulses and, for the soft x-ray range, employs an undulator-based beamline, equipped with an x-ray chopper and a varied line-space grating monochromator, tunable from 200 eV to 2000 eV. 22 The filling pattern of the Advanced Light Source synchrotron consists of 275 electron bunches spaced 2 ns apart. One so-called "camshaft" bunch (10 mA max.…”

Section: Methodsmentioning

confidence: 99%

Photo-Induced Spin-State Conversion in Solvated Transition Metal Complexes Probed via Time-Resolved Soft X-ray Spectroscopy

et al. 2010

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Solution-phase photo-induced low-spin to high-spin conversion in the Fe II polypyridyl complex [Fe(tren(py) 3 )] 2+ (where tren(py) 3 is tris(2-pyridylmethylimino-ethyl)amine) has been studied via picosecond soft x-ray spectroscopy. Following 1 A 1 → 1 MLCT (metal-to-ligand charge transfer) excitation at 560 nm, changes in the iron L 2 and L 3 edges were observed concomitant with formation of the transient high-spin 5 T 2 state. Charge-transfer multiplet calculations coupled with data acquired on low-spin and high-spin model complexes revealed a reduction in ligand field splitting of ~1 eV in the high-spin state relative to the singlet ground state. A significant reduction in orbital overlap between the central Fe-3d and the ligand N-2p orbitals was directly observed, consistent with the expected ca. 0.2 Å increase in Fe-N bond length upon formation of the high-spin state. The overall occupancy of the Fe 3d-orbitals remains constant upon spin-crossover, suggesting that the reduction in σ-donation is compensated by significant attenuation of π-back-bonding in the metal-ligand interactions. These results demonstrate the feasibility and unique potential of time-resolved soft x-ray absorption spectroscopy to study ultrafast reactions in the liquid phase by directly probing the valence orbitals of first-row metals as well as lighter elements during the course of photochemical transformations.

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“…We tested cesium iodide (CsI) and gold (Au) photocathodes of various coating thicknesses. We found that CsI photocathodes suffer from radiation damage after ~30 minutes exposure with flux a flux of 2x10 12 photons/second/mm 2 at 300eV at the Advanced Light Source (ALS) undulator beamline 6.0.2 [14]. Our transmission geometry Au photocathode also damaged rapidly (~30 minutes) when it was exposed to the undulator x-ray beam.…”

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confidence: 88%

A grazing incidence x-ray streak camera for ultrafast, single-shot measurements

Feng

Engelhorn

Cho

et al. 2010

Applied Physics Letters

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An ultrafast x-ray streak camera has been realized using a grazing incidence reflection photocathode. X-rays are incident on a gold photocathode at a grazing angle of 20 degree and photoemitted electrons are focused by a large aperture magnetic solenoid lens. The streak camera has high quantum efficiency, 600fs temporal resolution, and 6mm imaging length in the spectral direction. Its single shot capability eliminates temporal smearing due to sweep jitter, and allows recording of the ultrafast dynamics of samples that undergo non-reversible changes.

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The Advanced Light Source (ALS) Slicing Undulator Beamline

Cited by 16 publications

References 0 publications

The mechanism of ultrafast structural switching in superionic copper (I) sulphide nanocrystals

The mechanism of ultrafast structural switching in superionic copper (I) sulphide nanocrystals

Photo-Induced Spin-State Conversion in Solvated Transition Metal Complexes Probed via Time-Resolved Soft X-ray Spectroscopy

A grazing incidence x-ray streak camera for ultrafast, single-shot measurements

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