Remote blue shift

In orthopyroxenes, the very intense Fe2+/M2 site bands near 11,000 cm-1 and 5,000 cm-1 in spectra measured at atmospheric pressure (cf. fig. 5.15), as well as the Fe2+/Ml site band located at 8,333 cm-1, show pressure-induced blue-shifts (Shankland et al., 1974 Mao and Bell, 1971). At elevated temperatures, the Fe2+/M2 site 1 micron (11,000 cm-1) band shows negligible thermal shifts (Sung et al., 1977 Singer and Roush, 1985). However, the 2 micron (5,000 cm-1) band shows a significant red-shift in orthopyroxenes and a blue-shift in clinopyroxenes (Singer and Roush, 1985). These effects, which have important applications in remote-sensed spectral measurements of hot planetary surfaces, are described in chapter 10 ( 10.7). 

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