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Gyration and Permittivity of Ethylenediammonium Sulfate Crystals
Author(s) -
Nichols Shane,
Martin Alexander,
Choi Joshua,
Kahr Bart
Publication year - 2016
Publication title -
chirality
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.43
H-Index - 77
eISSN - 1520-636X
pISSN - 0899-0042
DOI - 10.1002/chir.22603
Subject(s) - chemistry , optical rotation , cleavage (geology) , perpendicular , optical axis , diffraction , chirality (physics) , ellipsometry , crystallography , polarization (electrochemistry) , optics , permittivity , dielectric , thin film , nanotechnology , materials science , optoelectronics , physics , composite material , organic chemistry , geometry , mathematics , chiral symmetry breaking , quark , quantum mechanics , nambu–jona lasinio model , lens (geology) , fracture (geology)
Ethylenediammonium sulfate (EDS) crystals were grown from aqueous solution and cleaved into thin (100–500 micron) plates. The 422 point group of EDS was confirmed by X‐ray diffraction. The constitutive relations of EDS crystals were determined through generalized ellipsometry with an instrument that uses four photoelastic modulators (4PEM). The optical rotation at 500 nm, for example, was + 22.9°/mm along the optic axis and − 12.1°/mm perpendicular to the optic axis for the P 4 1 2 1 2 crystals. Enantiomorphous twins frequently form across the (001) plane. Mirrored halves must be separated by cleavage in advance of optical measurements. Chirality 28:460–465, 2016 . © 2016 Wiley Periodicals, Inc.