Time-resolved optical diagnostics of non-equilibrium supercritical state in molecular media under ns laser-plasma impactстатья
Статья опубликована в высокорейтинговом журнале
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Дата последнего поиска статьи во внешних источниках: 10 ноября 2021 г.
Аннотация:We proposed a complex method based on a combination of shadow photography andtime-resolved Raman spectroscopy to observe the non-stationary laser-induced supercritical statein molecular media. Shadow photography is applied for retrieving pressure values, while Ramanspectroscopy with molecular dynamics for temperature estimation. Time resolution of 0.25 nsis achieved by varying the delay between the pump (creating an extreme energy delivery) andthe probe laser pulses by the self-made digital delay electronic circuit . The proposed methodwas employed in liquid carbon dioxide and water. Under nanosecond laser pulse impact, theestimated temperatures and pressures (∼700 K and ∼0.5 GPa) achieved in media are higher thanthe critical parameters of the samples.