Absorption of polarized light by a crystal that depends upon the orientation of the crystal with respect to the plane of polarization, cf. LeverA.B.P., Inorganic Electronic Spectroscopy (Elsevier, New York, 1968), Chap. 6.
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8.
This implies that the solvent must be of lesser specific gravity than the crystal, which is, indeed, very often the case or can be arranged as such.
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11.
Care was taken to center the crystal face initially on the quartz disk to effect a level surface for the floating crystal.
12.
Methylene chloride is a faster solvent than chlorobenzene for dissolving Lucite; however, its rapid evaporation cooling cracks the thermally sensitive Cu(methoxyacetate)2-2H2O.