angle of optical rotation, \(\alpha\)
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https://doi.org/10.1351/goldbook.A00348
angle through which plane polarized light is rotated clockwise, as seen when facing the light source, in passing through an optically active medium.
Source:
Green Book, 2
nd
ed., p. 33 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)