Ultrafast Thermal Melting in Nonequilibrium Warm Dense Copper
N. Jourdain, L. Lecherbourg, V. Recoules, P. Renaudin, F. Dorchies
Abstract
The ultrafast dynamics of the loss of crystalline periodicity is investigated in femtosecond laser heated warm dense copper, by the original use of x-ray absorption near-edge specific structures just above the L3 edge. The characteristic time is observed near 1 ps, for specific energy density ranging from 1 to 5 MJ/kg, using ps-resolution x-ray absorption spectroscopy. The overall experimental data are well reproduced with two-temperature hydrodynamic simulations, supporting a thermal phase transition.
Topics & Concepts
FemtosecondUltrashort pulseCopperMaterials scienceThermalAbsorption (acoustics)SpectroscopyLaserAbsorption edgeNon-equilibrium thermodynamicsMolecular physicsAtomic physicsWarm dense matterPhysicsOpticsThermodynamicsOptoelectronicsComposite materialMetallurgyBand gapQuantum mechanicsLaser Material Processing TechniquesHigh-pressure geophysics and materialsLaser-Ablation Synthesis of Nanoparticles