- Raman optical activity
Raman optical activity (ROA) is a vibrational spectroscopic technique that is reliant on the difference in intensity of Raman scattered right and left circularly polarised light due to molecular chirality.
History of Raman optical activity
The field began with the doctoral work of Laurence D. Barron with
Peter Atkinsat the University of Oxfordand was later further developed by Barron with David Buckinghamat the University of Cambridge.
More developments, including important contributions to the development of practical Raman optical activity instruments, were made by
Werner Hugof the University of Friburg, and Lutz Hechtwith Laurence Barron at the University of Glasgow.
Theory of Raman optical activity
The basic principle of Raman optical activity is that there is interference between light waves scattered by the polarisability and optical activity
tensors of a chiral molecule, which leads to a difference between the intensities of the right- and left-handed circularly polarised scattered beams. The spectrum of intensity differences recorded over a range of wavenumbers reveals information about chiral centres in the sample molecule.
Biological Raman optical activity spectroscopy
Due to its sensitivity to chirality, Raman optical activity is a useful probe of biomolecular structure and behaviour in aqueous solution. It has been used to study protein, nucleic acid, carbohydrate and virus structures. Though the method does not reveal information to the atomic resolution of crystallographic approaches, it is able to examine structure and behaviour in biologically more realistic conditions (compare the dynamic solution structure examined by Raman optical activity to the static crystal structure).
Related spectroscopic methods
Raman optical activity spectroscopy is related to
Raman spectroscopyand circular dichroism.
Raman optical activity instruments
A simple introduction to Raman optical activity instruments can be found on Laurence Barron's site [http://www.chem.gla.ac.uk/staff/laurence/research/instrumentation.htm] . Much of the existing work in the field has utilised custom-made instruments, though commercial instruments are now available.
* [http://www.chem.gla.ac.uk/staff/laurence/research/ROAHome.htm Laurence D. Barron's ROA page] .
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