= Stanley Block
{c}
{tag=Physicist}
= S. Block
{c}
{synonym}
<Stanley Block> coauthored a pressure-measurement method using the sharp <fluorescence> lines of <ruby> inside a <diamond anvil cell>. Compression shifts the line energies, allowing a tiny optical marker to report <pressure> in a region inaccessible to an ordinary mechanical gauge. Calibration turns that spectral shift into a quantitative <pressure> reading. Line broadening can also reveal departures from uniform hydrostatic compression, so the spectrum contains information about the measurement conditions as well as the mean <pressure>.<Pressure Measurement Made by the Utilization of Ruby Sharp-Line Luminescence by Richard A. Forman and others>[Science 176, 284–285 (1972), ruby-line shift and nonhydrostatic broadening]{ref}
A <physicist> who led crystallographic research and developed ruby <fluorescence> pressure measurements.<Responding to National Needs: The National Bureau of Standards Becomes the National Institute of Standards and Technology, 1969–1993 by J. F. Schooley>[p.289, portrait caption: solid state physicist; NBS Crystallography Section]{ref}
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