title: Brillouin scattering studies of liquid argon at high temperatures and high pressures.
abstract: Brillouin scattering measurements were performed on liquid argon in a diamond anvil cell at various solidification points up to 503 K. With the measured results from the 60 degree platelet- and 180 degree back-scattering geometries, the sound velocity, refractive index, experimental equation of state, and adiabatic bulk modulus of liquid argon as a function of pressure were determined. The discrepancy between experimental and previous calculated equation of state indicates that the many-body contribution to the density of liquid argon increases with increasing pressure and decreases with increasing temperature. By analyzing the Brillouin spectra in the coexistence of liquid and solid phase regions, the volume change and latent heat of solid-liquid transformation along the equilibrium curve have been also obtained for the first time.
authors.affiliation: Laboratory of High Pressure Physics, Southwest Jiaotong University, Chengdu 610031, China.
authors.forename: Ru
authors.initials: R
authors.lastname: Jia
authors.forename: Fangfei
authors.initials: F
authors.lastname: Li
authors.forename: Min
authors.initials: M
authors.lastname: Li
authors.forename: Qiliang
authors.initials: Q
authors.lastname: Cui
authors.forename: Zhi
authors.initials: Z
authors.lastname: He
authors.forename: Liancheng
authors.initials: L
authors.lastname: Wang
authors.forename: Qiang
authors.initials: Q
authors.lastname: Zhou
authors.forename: Tian
authors.initials: T
authors.lastname: Cui
authors.forename: Guangtian
authors.initials: G
authors.lastname: Zou
authors.forename: Yan
authors.initials: Y
authors.lastname: Bi
authors.forename: Shiming
authors.initials: S
authors.lastname: Hong
authors.forename: Fuqian
authors.initials: F
authors.lastname: Jing