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Figure 2
Ruby fluorescence spectra from outside the diamond cell at 1 atm (shorter wavelengths) and from 51 GPa (longer wavelengths). Hydrostatic pressure conditions were achieved in this experiment using a helium pressure medium. This figure illustrates minimal separation between the R1 and R2 fluorescence lines (R1 − R2 in nm), a proxy for differential stress in the cell. For comparison, the 1 atm spectrum is also shown shifted (dashed line) under the 51 GPa spectrum (solid line). The R1 − R2 separation at 50 GPa in a 4:1 methanol:ethanol pressure medium was reported to be 2.0 nm (Takemura, 2001BB31).

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 12| Part 5| August 2005| Pages 577-583
doi:10.1107/S0909049505022326
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