Publications by authors named "C Ferchaud"

Professional support for elderly people suffering from cognitive impairment needs to be comprehensive, and requires the active involvement of a wide range of professionals. Two clinical cases show how the combined support of a therapeutic day-care center and medical specialists can improve the quality of life of patients and their families, by helping to refine diagnoses or adjust treatment.

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The development of ultra-thin flat liquid sheets capable of running in vacuum has provided an exciting new target for X-ray absorption spectroscopy in the liquid and solution phases. Several methods have become available for delivering in-vacuum sheet jets using different nozzle designs. We compare the sheets produced by two different types of nozzle; a commercially available borosillicate glass chip using microfluidic channels to deliver colliding jets, and an in-house fabricated fan spray nozzle which compresses the liquid on an axis out of a slit to achieve collision conditions.

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We experimentally study the interaction between intense infrared few-cycle laser pulses and an ultrathin (∼2 µm) flat liquid sheet of isopropanol running in vacuum. We observe a rapid decline in transmission above a critical peak intensity of 50 TW/cm of the initially transparent liquid sheet, and the emission of a plume of material. We find both events are due to the creation of a surface plasma and are similar to processes observed in dielectric solids.

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Article Synopsis
  • * Using advanced techniques like time-resolved X-ray absorption spectroscopy, researchers analyze the dynamics when excitons are created by a quick optical pulse.
  • * Findings reveal that the initial excitonic state is spread out across several polymer chains and quickly transitions into a more localized state in under 50 femtoseconds, which is crucial for enhancing charge transfer efficiency.
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We demonstrate a 100 kHz optical parametric chirped-pulse amplifier delivering under 4-cycle (38 fs) pulses at ~3.2 µm with an average power of 15.2 W with a pulse-to-pulse energy stability <0.

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