Abstract: Vibrational optical activity (VOA) is a collective term applied to two spectroscopic techniques discovered during the early 1970s. The two techniques, which had been predicted on theoretical grounds, are infrared (IR) or vibrational circular dichroism (VCD), and Raman optical activity (ROA). Conceptually, one may view VCD as an extension of the principles of electronic circular dichroism (ECD), normally observed in the UV spectral region, into the domain of vibrational transitions in the IR spectral region. VCD can be observed via dispersive or Fourier transforms (FT) instrumentation. VCD intensity can be produced by the dipolar coupling of (virtually achiral) vibrational transitions, which are in a fixed, dissymmetric geometric pattern, such as a helix. ROA is the differential inelastic scattering of circularly polarized light from chiral molecules. The classical ROA experiment is carried out using a standard Raman instrument to which light modulation optics has been added.
Publication Year: 2015
Publication Date: 2015-06-19
Language: en
Type: other
Indexed In: ['crossref']
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Cited By Count: 1
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