in 
Abstract
The effect of high hydrostatic pressure, up to 100 kbar, on the emission spectra of 
ions in 
hosts was studied. A linear shifting (red-shift) of the single-ion line (the R line), the left-hand side (LS) line, right-hand side (RS) line and the neighbouring-pair line (NPL) was observed. The R line shows a pressure-induced shift of 
, nearly 2.25 times that of ruby. The LS line, RS line and NPL show pressure-induced shifts of 
, 
and 
, respectively.
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