The ruby pressure standard to 150GPa

A determination of the ruby high-pressure scale is presented using all available appropriate measurements including our own. Calibration data extend to 150GPa. A careful consideration of shock-wave-reduced isotherms is given, including corrections for material strength. The data are fitted to the calibration equation P=(A∕B)[(λ∕λ0)B−1] (GPa), with A=1876±6.7, B=10.71±0.14, and λ is the peak wavelength of the ruby R1 line.