Induction of ice VII structure with secondary shock compression by backward Raman scattering in plasmas

Author:

Li Fabing1ORCID,Sun Chenglin2

Affiliation:

1. Institute of Atomic and Molecular Physics, Jilin University 1 , Changchun 130012, China

2. Key Laboratory of Physics and Technology for Advanced Batteries, College of Physics, Jilin University 2 , Changchun 130012, China

Abstract

Forward stimulated Raman scattering and backward stimulated Raman scattering (BSRS) are measured when an intense 532 nm nanosecond pulsed laser is focused into water and heavy water. The investigation reveals a significant observation: the formation of the ice VII structure exclusively occurs in the backward direction when optical breakdown takes place, provided that the input energy falls below 90 mJ for liquid water or 75 mJ for heavy water. This phase transition is attributed to secondary shock compression, which comes from energy transfer and compression between the BSRS in plasmas with the pump laser. The optical breakdown experiment under pre-pressure reveals that the shock compression in the back direction is approximately 2.3 times that of the forward direction. This research is useful for shock compression and dynamics in plasmas.

Funder

National Natural Science Foundation of China

Publisher

AIP Publishing

Subject

General Physics and Astronomy

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