Gyration and Permittivity of Ethylenediammonium Sulfate Crystals

Shane Nichols, Alexander Martin, Joshua Choi, Bart Kahr

Research output: Contribution to journalArticlepeer-review


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 P41212 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.

Original languageEnglish (US)
Pages (from-to)460-465
Number of pages6
Issue number6
StatePublished - Jun 1 2016


  • bianisotropic
  • chiral twinning
  • ellipsometry
  • gyration
  • multiple reflections
  • optical activity
  • polarimetry

ASJC Scopus subject areas

  • Analytical Chemistry
  • Catalysis
  • Pharmacology
  • Drug Discovery
  • Spectroscopy
  • Organic Chemistry


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