Pressure evaluation

Reference spectrum file

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In txt format with wavelength and intensity columns

Reference temperature

°C

Might include uncertainty, e.g. 22.5(2)

Measurement spectrum file*

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In txt format with wavelength and intensity columns

Measured temperature

°C

Might include uncertainty, e.g. 22.5(2)

Backfitting strategy*

Peakfitting strategy*

Correcting strategy*

Translating strategy*

Ruby pressure scale

Ruby crystals exhibit a strong doublet of fluorescence signals around 693 and 694 nm, respectively. The position of these peaks, called usually R₂ and R₁, shifts with both temperature and pressure. In the temperature is known, the wavelength of the fluorescence can be used to evaluate the pressure experienced by the sample. This is commonly referred to as the "ruby fluorescence method".

There are countless workflows which lead from the raw fluorescence spectrum to the determined value of pressure. This stems from the fact that there are numerous distinct ways to: model the spectrum background, determine R₂ and R₁ positions, correct for non-standard temperature, as well as to translate the peak position into pressure. Some of these methods have been implemented in package pruby, which aims to provide a common interface for multiple techniques.

References

If you have found this page useful or you have utilised this pressure evaluation tool in your work, please consider citing the following website:

Tchoń. D. pRuby: Python library for calculating pressure based on Ruby fluorescence. GitHub (2017), Available at: https://github.com/Baharis/pRuby.

The following articles were used when preparing individual correcting and translation strategies:

Jacobsen S. D. et al. Compression of single-crystal magnesium oxide to 118 GPa and a ruby pressure gauge for helium pressure media American Mineralogist 93, 11–12, 1823–1828 (2008)
Liu. L., Bi Y. and Ji-An X. Ruby fluorescence pressure scale: Revisited Chin. Phys. B 22, 5, 056201 (2013)
Mao H. K., Bell P. M., Shaner J. W., and Steinberg D. J. Specific volume measurements of Cu, Mo, Pd, and Ag and calibration of the ruby R₁ fluorescence pressure gauge from 0.06 to 1 Mbar J. Appl. Phys. 49, 6, 3276–3283 (1978)
Piermarini G. J., Block S., Barnett J. D., and Forman R. A. Calibration of the pressure dependence of the R₁ ruby fluorescence line to 195 kbar J. Appl. Phys. 46, 6, 2774–2780 (1975)
Shen G. et al. Toward an international practical pressure scale: A proposal for an IPPS ruby gauge (IPPS-Ruby2020) High Pressure Research 40, 3, 299–314 (2020)
Wei. Q., Dubrovinskaia N. and Dubrovinsky L. Ruby and Sm:YAG fluorescence pressure gauges up to 120 GPa and 700 K J. Appl. Phys. 110, 4, 043513 (2011)
Vos. W. L. and Schouten J. A. On the temperature correction to the ruby pressure scale J. Appl. Phys. 69, 9, 6744–6746 (1991)
Ragan D. D., Gustavsen R., and Schiferl D. Calibration of the ruby R1 and R2 fluorescence shifts as a function of temperature from 0 to 600 K J. Appl. Phys. 72, 12, 5539–5544 (1992)