Results 241 to 250 of about 30,908 (277)

Ultrafast x-ray absorbtion and diffraction

SPIE Proceedings, 1995
Our goal is to watch the evolution of matter on the atomic length scale and on the time scale on which elementary chemical reactions take place. We present initial experiments made in collaboration between UCSD and the INRS laboratory in Canada, on time-resolved ultrafast, 3 ps temporal resolution, near-edge x-ray absorption of gas phase SF6 at 2.4 keV
Christopher P. P. Barty, Ferenc Raksi, Christoph G. Rose-Petruck, Kenneth J. Schafer, Kent R. Wilson, Vladislav V. Yakovlev, Koichi Yamakawa, Zhiming Jiang, Abdelaziz Ikhlef, Christian Y. Cote, Jean-Claude Kieffer   +10 more
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Ultrafast X-ray diffraction and X-ray absorption spectroscopy

Conference Digest. 2000 Conference on Lasers and Electro-Optics Europe (Cat. No.00TH8505), 2000
Summary form only given. Recently developed ultrafast laser-driven X-ray sources enable the observation of atomic motions in crystals and in solutions on the timescale of chemical bond formation and breakage. Using such a laboratory-based X-ray source the propagation of coherent phonon wave packets through GaAs(111) crystals after photo excitation has ...
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Ultrafast Coherent Diffractive X-ray Imaging

Frontiers in Optics 2007/Laser Science XXIII/Organic Materials and Devices for Displays and Energy Conversion, 2007
Single ultrafast pulse high-resolution coherent x-ray images and holograms have been recorded at the FLASH free-electron laser. These experiments point the way to near-atomic resolution imaging at future x-ray laser sources.
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Ultrafast X-ray and Electron Diffraction:  Theoretical Considerations

The Journal of Physical Chemistry A, 1997
Time-dependent ultrafast diffraction measurements can be directly inverted to obtain the dynamics of atomic motions, in contrast to ultrafast spectra which require detailed knowledge of the sample (e.g., potential energy surfaces) for their inversion.
M. Ben-Nun, Jianshu Cao, Kent R. Wilson
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Ultrafast time-resolved X-ray diffraction

AIP Conference Proceedings, 2002
Femtosecond laser‐generated plasmas emit ultrashort X‐ray pulses in the multi‐keV range, which allow the extension of X‐ray spectroscopy into the ultrafast time‐domain. We report here on the generation of such short X‐ray pulses and their application for time‐resolved diffraction as a means to directly study ultrafast structural dynamics in laser ...
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Ultrafast X-ray Diffraction of Transient Molecular Structures in Solution

Science, 2005
We report direct structural evidence of the bridged radical (CH 2 ICH 2 ·) in a polar solution, obtained using time-resolved liquid-phase x-ray diffraction. This transient intermediate has long been hypothesized to explain stereo-chemical control in many association and/or dissociation ...
Ihee, H Ihee, Hyotcherl, Lorenc, M, Kim, TK, Kong, QY, Cammarata, M, Lee, JH, Bratos, S, Wulff, M   +7 more
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Monitoring Ultrafast Photoisomerization of Azobenzene by Time-Resolved X-Ray Diffraction

Frontiers in Optics / Laser Science, 2020
Time-resolved X-Ray diffraction signals are simulated to monitor the ultrafast photoisomerization of azobenzene, a textbook photophysical process. Different signal contributions, with a special focus on scattering from coherences emerging at the conical intersection, are discussed.
Keefer D., Aleotti F., Rouxel J., Segatta F., Gu B., Nenov A., Garavelli M., Mukamel S.   +7 more
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Ultrafast Diffractive X-Ray Optics

2003
A class of x-ray optical elements is proposed that use effects of dynamical x-ray diffraction under conditions of rapidly changing structure factors to manipulate x-rays.
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Ultrafast X-ray Diffraction Tracks Molecular Shape-Shifting

Physics Today, 2001
The molecular workings of photosynthesis, vision, and other light-driven processes can now be studied on the time scales on which they occur.
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Subpicosecond X-ray diffraction mesasurement of InSb ultrafast melting

Ultrafast Phenomena, 2000
Subpicosecond atomic behaviour following 100 fs laser excitation is investigated in InSb by time-resolved X-ray diffraction. The process of non-thermal melting is observed and characterized in the subpicosecond time-scale.
Antoine Rousse, S. Fourmaux, S. Sebban, D. Hulin, Christian Rischel, Ingo Uschmann, Eckhart Förster, Jean-Paul Geindre, Patrick Audebert, Jean-Claude Gauthier   +9 more
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