Oriented circular dichroism spectroscopy

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    Oriented circular dichroism (OCD) spectroscopy, as the name implies, is the circular dichroism spectroscopy of oriented samples. It can be a very useful technique; however, it is prone to artifacts resulting from linear dichroism contributions to the observed spectrum (Nordén et al. 2010). Thus care must be taken in collecting and analyzing the data. A sample for OCD should be symmetric about a unique orientation axis. Data must then be collected with the light propagating along that unique axis and spectra measured at different rotations about the unique axis compared. If the rotated spectra are the same, then these data can be believed. If the sample is perfectly oriented (as it would be in a perfectly oriented crystal but probably in no other method), the observed spectrum is then equivalent to three times (no rotational averaging) the CD spectrum of all the transitions in an isotropic sample except those polarized along the unique axis (which are invisible).
    Original languageEnglish
    Title of host publicationEncyclopedia of Biophysics
    EditorsGordon Roberts, Anthony Watts, European Biophysical Societies
    Place of PublicationBerlin
    PublisherSpringer, Springer Nature
    Number of pages2
    EditionLiving Edition
    ISBN (Electronic)9783642359439
    Publication statusPublished - 28 Jul 2018


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