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Time-resolved x-ray imaging of a laser-induced nanoplasma and its neutral residuals

Video in TIB AV-Portal: Time-resolved x-ray imaging of a laser-induced nanoplasma and its neutral residuals

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Time-resolved x-ray imaging of a laser-induced nanoplasma and its neutral residuals
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CC Attribution 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
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2016
Language
English

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Abstract
The evolution of individual, large gas-phase xenon clusters, turned into a nanoplasma by a high power infrared laser pulse, is tracked from femtoseconds up to nanoseconds after laser excitation via coherent diffractive imaging, using ultra-short soft x-ray free electron laser pulses. A decline of scattering signal at high detection angles with increasing time delay indicates a softening of the cluster surface. Here we demonstrate, for the first time a representative speckle pattern of a new stage of cluster expansion for xenon clusters after a nanosecond irradiation. The analysis of the measured average speckle size and the envelope of the intensity distribution reveals a mean cluster size and length scale of internal density fluctuations. The measured diffraction patterns were reproduced by scattering simulations which assumed that the cluster expands with pronounced internal density fluctuations hundreds of picoseconds after excitation.

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reinitiated radiation-damaged inuit doting clusters and image to particle expanding with an extra poles at varying time delays from pico 2 nanoseconds for each different time delay over color images were recorded as we increase the delay time the diffraction patterns became learner and we recorded less elastically scattered photons at high scattering angles less high-angle scattered is correlated to a softening of the surface when the particle becomes ionized and our 2 layers explode this occurs at the picosecond time scale on the nanosecond timescale when are
ionized particle has remind you neutrality speckles appear in a diffraction
pattern this had not been seen before from
single clusters so we asked ourselves how can we extract a particle information from the speckle patterns when the density in the
particle drops below a certain threshold the concentric rings of the diffraction pattern morph into a speckle pattern the speckle slicing in the diffraction pattern decreases with increasing particle size so when a cluster expound homogeneously the pattern transitions from race to speckles and the speckle size decreases in our experiments the measured speckle patterns exhibit over modulation in the scattering intensity envelope indicating that the class that did not affect this integrate homogeneous and instead are passed the fragmented but density fluctuations and by increasing the density range the intensity minimum shifts toward smaller angles by analyzing the average speckle size and the angle of the over modulation minimum from the diffraction pattern you have to model chronicler Classics'' integrated in
our experiments we were able to measure didn't on pick a 2nd time scale the outer surface of the nanoparticle explodes all while no longer nanosecond time scale after the inner part of our particle has time for command you neutrality the particle disintegrates with internal density fluctuations
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