Relative diffuse reflectance spectra of microcrystalline HgI2 powder are made between 15000 and 27000 cm−l, at temperatures from ≈ 5 to 530 K. They are transformed into Kubelka‐Munk function spectra. α‐HgI2 shows exciton absorption and emission spectra as well as a strong lu‐ minescence band at 17860 cm−l at ≈ 5 K which shifts to 18700 cm−l at 80 K. Three new low temperature phases are observed when β‐HgI2, is quenched from temperatures above 400 K to 80 or 4.2 K.
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