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A tandem Fabry-Perot interferometer has been used to locate Raman bands at 12 cm^-1 (B-DNA) and 15 and possibly 12 cm^-1 (A-DNA). The Raman shift of these bands is dispersionless and the scattering process appears to require quasimomentum conservation. We assign these bands to the lowest-lying Raman-active optic phonons.
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Lindsay et al. (1984) studied this question.
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