Femtosecond time-resolved X-ray diffraction from laser-heated organic films

Article Abstract:

Studies show that a timescale of under a picosecond can be achieved in monitoring changes in an organic film's X-ray diffraction pattern after laser pulse heating. A Langmuir-Blodgett multilayer cadmium arachidate film's response to laser heating is observed, with intensity seen to decrease significantly following one picosecond of heating. Thin film diffraction is shown to switch off ultra quickly, demonstrating that large structural rearrangements can occur in condensed matter on the femtosecond timescale.

Letter to the Editor, Laser pulses, Ultrashort, Ultrashort laser pulses, Cadmium

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Double vision

Article Abstract:

Ultrafast X-ray pulses from a free-electron laser are used for yielding a series of femtosecond-resolved holographic images of an evolving nanometre-scale object. The time-resolved holography has provided a new way to generate images on both microscopic and mesoscopic scales.

All Other Miscellaneous Electrical Equipment and Component Manufacturing, Free Electron Lasers, Analysis, Holography

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Femtosecond X-ray measuyrement of coherent lattice vibrations near the Lindemann stability limit

Article Abstract:

Ultrafast laser-induced changes of long-range order using time-resolved X-ray diffraction have been used to study phase-transition dynamics in solids in the 10 (super -14) to 10 (super -12) second range. Discusses the technique, accompanied by graphs.

Science & research, Phase transformations (Statistical physics), Phase transitions (Physics), Solid state physics

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