Data files and images of H2O in beryl
GRR 194 image, 5K; Pale blue beryl from Brazil, 2.33 mm thick. The band near 5200 cm-1 polarized paralled to c is from the combined bending and stretching of water in the c-axis channels (Type I, with the H-H direction oriented parallel to the channels). The bands in the 4000 - 3200 cm-1 region are also from water in the channels, but represent stretching motions. Data Files: a 23K; ; c 23K.GRR 313 image, 5K; Nearly colorless beryl from Minas Gerais, Brazil, 0.50 mm thick, looking down the c-axis. The figure compares spectra obtained in unpolarized light propagating down the c-axis before and after the crystal was heated to 1000°C. It is interesting to note that even at this high temperature, all the water is not lost. Data Files: unheated 23K; heated 23K.
Comparison, 5K; Comparison of the beryl spectra of GRR 313 and BW 1 in the 3800 cm-1 region. The bands in this region are from water in the channels. Both samples are plotted for 0.5 mm thickness of a (0001) slab in unpolarized radiation.
The band in the OH region are temperature dependent. Here are
the E||c and E
perp c spectra at room and liquid nitrogen temperature for a 1.067
mm thick slab of colorless beryl from Hunza, Paraiso, Pakistan.
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