研究目的
Investigating the structural dynamics of atomic clusters pumped into a nanoplasma state by intense near-infrared laser pulses.
研究成果
The crystalline order in xenon clusters persists long after the driving laser pulse, with structural disorder propagating from the surface to the core at a speed compatible with the plasma speed of sound. This provides new insights into the structural dynamics of highly nonequilibrium nanoplasma states.
研究不足
The study focuses on xenon clusters and may not directly apply to other materials. The temporal resolution is limited by the jitter between the XFEL and NIR pulses.
1：Experimental Design and Method Selection:
The study employed wide-angle x-ray scattering (WAXS) with femtosecond x-ray pulses from a free-electron laser to observe the structural dynamics of xenon clusters pumped by intense NIR laser pulses.
2：Sample Selection and Data Sources:
Xenon clusters were generated by adiabatic expansion of Xe gas through a nozzle, with an average cluster size estimated around 1 × 107 atoms/cluster.
3：List of Experimental Equipment and Materials:
The setup included a jet of free Xe clusters, NIR laser pulses (800 nm, 30 fs), XFEL pulses (1.1 ?, 10 fs), and a multiport charge-coupled device (MPCCD) for detecting scattered x-ray photons.
4：1 ?, 10 fs), and a multiport charge-coupled device (MPCCD) for detecting scattered x-ray photons.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The cluster jet was irradiated by a single NIR laser pulse followed by single XFEL pulses at selected delays. The scattered x-ray photons were recorded to analyze the structural dynamics.
5：Data Analysis Methods:
The temporal evolution of the Bragg spots' intensity and width was analyzed to deduce changes in the crystalline core radius and structure.
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