Electronic and atomic kinetics in solids irradiated with free-electron lasers or swift-heavy ions

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS

卷:365

Article

Medvedev, N.¹  Volkov, A. B.^2,3,4  Ziaja, B.^1,5 

[1] DESY, Ctr Free Electron Laser Sci, D-22607 Hamburg, Germany

[2] JINR, FLNR, Dubna 141980, Russia

[3] NRC Kurchatov Inst, Moscow 123182, Russia

[4] Russian Acad Sci, LPI, Moscow 119991, Russia

[5] Polish Acad Sci, Inst Nucl Phys, PL-31342 Krakow, Poland

关键词: Free-electron laser;    Swift-heavy ion;    Electron kinetics;    Nonthermal melting;    Nonequilibrium;   

DOI  :  10.1016/j.nimb.2015.08.063

来源: Elsevier

【 摘 要 】

In this brief review we discuss the transient processes in solids under irradiation with femtosecond X-ray free-electron-laser (FEL) pulses and swift-heavy ions (SHI). Both kinds of irradiation produce highly excited electrons in a target on extremely short timescales. Transfer of the excess electronic energy into the lattice may lead to observable target modifications such as phase transitions and damage formation. Transient kinetics of material excitation and relaxation under FEL or SHI irradiation are comparatively discussed. The same origin for the electronic and atomic relaxation in both cases is demonstrated. Differences in these kinetics introduced by the geometrical effects (mu m-size of a laser spot vs nm-size of an ion track) and initial irradiation (photoabsorption vs an ion impact) are analyzed. The basic mechanisms of electron transport and electron-lattice coupling are addressed. Appropriate models and their limitations are presented. Possibilities of thermal and nonthermal melting of materials under FEL and SHI irradiation are discussed. (C) 2015 Elsevier B.V. All rights reserved.

【 授权许可】

Free