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Figure 2
(a) Laser- and X-ray-induced fluorescence of ruby, showing peak shifts and the relative intensity of laser- and X-ray-induced spectra. In addition to being red-shifted, the R1 and R2 peaks become broader at higher temperatures. The inset shows the unscaled spectra. (b) Calibration curve showing the position in wavelength of the ruby R1 and R2 fluorescence peaks obtained from (2)[link] and (3)[link]. Note that the cubic function has a stationary point at 50 K (R1) and 40 K (R2), so temperatures below this would result in a peak with the same wavelength at a higher temperature. Temperatures below 80 K were not investigated as part of this study.

Journal logoJOURNAL OF
SYNCHROTRON
RADIATION
ISSN: 1600-5775
Volume 26| Part 4| July 2019| Pages 991-997
https://doi.org/10.1107/S1600577519003849
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