Ablating Ion Velocity Distributions in Short-Pulse-Heated Solids via X-Ray Doppler Shifts

Autor:	B. F. Kraus, Lan Gao, W. Fox, K. W. Hill, M. Bitter, P. C. Efthimion, A. Moreau, R. Hollinger, Shoujun Wang, Huanyu Song, J. J. Rocca
Rok vydání:	2022
Předmět:	General Physics and Astronomy
Zdroj:	Physical Review Letters. 129
ISSN:	1079-7114 0031-9007
Popis:	Solids ablate under laser irradiation, but experiments have not previously characterized the initiation of this process at ultrarelativistic laser intensities. We present first measurements of bulk ion velocity distributions as ablation begins, captured as a function of depth via Doppler-shifted x-ray line emission from two viewing angles. Bayesian analysis indicates that bulk ions are either nearly stationary or flowing outward at the plasma sound speed. The measurements quantitatively constrain the laser-plasma ablation mechanism, suggesting that a steplike electrostatic potential structure drives solid disassembly.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::20b0f698492676bc470e56fb39e8c1b5 https://doi.org/10.1103/physrevlett.129.235001 Zobrazit plný text záznamu