issue contents

Journal logoJOURNAL OF
ISSN: 1600-5775

July 2007 issue

Highlighted illustration

Cover illustration: Synchronization of laser and X-ray pulses at beamline NW14A of the Photon Factory Advanced Ring (see Nozawa et al., pages 313-319). The timing control is based on the RF master clock that drives a single electron bunch in the ring. An X-ray chopper is phase-locked at 945 Hz and isolates 945 Hz X-ray pulses from the X-ray pulse train at 794 kHz. The mode-locked Ti:sapphire laser is operated as the seeding laser and is guided to the regenerative amplifier operated at 945 Hz. Then, the 100 ps X-ray and the 150 fs laser pulses are synchronized at 945 Hz. The two graphs show the photo-induced changes of diffraction intensity of TTF-CA crystal and the Ni-K near-edge spectral changes associated with the photoreaction of NiTPP(Pip)2; data were obtained by time-resolved diffraction and XAFS measurements at NW14A.

facility information

research papers

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A new experimental station at ESRF beamline ID20 is presented which allows magnetic and resonant X-ray scattering experiments in the energy range 3–25 keV to be performed under extreme conditions.

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Using a superconducting-wavelength-shifter X-ray source, three hard X-ray beamlines have been designed and constructed for structural studies.

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A two-step focusing set-up combining a Fresnel zone plate with an ellipsoidal capillary is presented. An X-ray beam with a 15 keV energy was focused down to 250 nm, demonstrating the best spot size that has been achieved up to now for single-bounce capillaries.

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The effect of the storage-ring fill pattern on the pile-up in energy-dispersive diffraction applications is presented.

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A differential pump assembly is introduced which can provide a windowless transition between an in-air sample environment and the high-vacuum region of a synchrotron radiation beamline for beam diameters of approximately 1 mm.

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The development of a new spectroscopic cell for in situ X-ray absorption spectroscopy and X-ray diffraction experiments in catalysis is presented and several case studies are discussed.

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An automatic crystal-centering method for high-throughput protein crystallography is described.

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A 2 m vertical inelastic scattering spectrometer with a resolution of 118 meV is introduced.

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An expression is derived for the line intensities in a nuclear forward-scattering energy spectrum taken with synchrotron radiation. It is shown that, for a magnetic sample, the spin direction can be directly determined from the line intensities.

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Observations and (some) solutions are reported for beam-size-related phenomena and effective normalization in energy-dispersive EXAFS for the study of heterogeneous catalysts, powder materials and the processes they mediate.

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Rapid characterization and imaging of the molecular chemistry of the seed inherent structures is described, revealing structural chemical features and nutrient component matrix in the seed tissue by using rapid, direct and non-destructive synchrotron-powered infrared microspectroscopy plus agglomerative hierarchical cluster and principal component analyses.

addenda and errata

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J. Synchrotron Rad. (2007). 14, 394
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