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Title: Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction

Abstract

The ultrafast laser excitation of matters leads to non-equilibrium states with complex solid-liquid phase transition dynamics. We used electron diffraction at mega-electronvolt energies to visualize the ultrafast melting of gold on the atomic scale length. For energy densities approaching the irreversible melting regime, we first observed heterogeneous melting on time scales of 100 ps to 1000 ps, transitioning to homogeneous melting that occurs catastrophically within 10-20 ps at higher energy densities. We showed evidence for the heterogeneous coexistence of solid and liquid. We determined the ion and electron temperature evolution and found superheated conditions. Our results constrain the electron-ion coupling rate, determine the Debye temperature and reveal the melting sensitivity to nucleation seeds.

Authors:
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1455020
DOE Contract Number:  
AC02-76SF00515
Resource Type:
Program Document
Country of Publication:
United States
Language:
English

Citation Formats

None, None. Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction. United States: N. p., 2018. Web.
None, None. Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction. United States.
None, None. Mon . "Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction". United States. https://www.osti.gov/servlets/purl/1455020.
@article{osti_1455020,
title = {Heterogeneous to homogeneous melting transition visualized with ultrafast electron diffraction},
author = {None, None},
abstractNote = {The ultrafast laser excitation of matters leads to non-equilibrium states with complex solid-liquid phase transition dynamics. We used electron diffraction at mega-electronvolt energies to visualize the ultrafast melting of gold on the atomic scale length. For energy densities approaching the irreversible melting regime, we first observed heterogeneous melting on time scales of 100 ps to 1000 ps, transitioning to homogeneous melting that occurs catastrophically within 10-20 ps at higher energy densities. We showed evidence for the heterogeneous coexistence of solid and liquid. We determined the ion and electron temperature evolution and found superheated conditions. Our results constrain the electron-ion coupling rate, determine the Debye temperature and reveal the melting sensitivity to nucleation seeds.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2018},
month = {1}
}

Program Document:
Other availability
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