The ruby pressure standard to 150 GPa

A determination of the ruby high-pressure scale is presented using all available appropriate measurements including our own. Calibration data extend to 150 GPa. 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)[(lambda/lambda(0))(B)-1] (GPa), with A=1876 +/- 6.7, B=10.71 +/- 0.14, and lambda is the peak wavelength of the ruby R1 line.