title: Velocity of sound and equations of state for methanol and ethanol in a diamond-anvil cell.
abstract: The adaptability of laser-induced phonon spectroscopy to the determination of acoustic velocity and the equation of state in the diamond-anvil high-pressure cell is demonstrated. The technique provides a robust method for measurements at high pressure in both solids and liquids so that important problems in high-pressure elasticity and the earth sciences are now tractable. The velocity of sound and the density of methanol at 25 degrees C have been measured up to a pressure of 6.8 gigapascals. These results imply a higher density (by approximately 5 percent) for liquid methanol above 2.5 gigapascals than that given in existing compilations. The adiabatic bulk modulus increases by a factor of 50 at a maximum compression of 1.8. The thermodynamic Grüneisen parameters of methanol and ethanol both increase with increasing pressure, in contrast to the behavior of most solids.
authors.forename: J M
authors.initials: JM
authors.lastname: Brown
authors.forename: L J
authors.initials: LJ
authors.lastname: Slutsky
authors.forename: K A
authors.initials: KA
authors.lastname: Nelson
authors.forename: L T
authors.initials: LT
authors.lastname: Cheng