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Polarized Raman spectra were obtained on well oriented films of α-helical poly(L-alanine) (α-PLA) and its N-deuterated analogue in order to obtain definitive assignments of the E2-species modes. Such assignments were aided by an analysis of factors that can lead to ‘cross-talk’ between A, E1 and E2 spectra, viz. reflection of the incident beam and non-perfect lateral and axial chain orientation in the sample. The convincing assignment of at least eleven significant E2 modes in α-PLA has led to the refinement of a new empirical force field and a more detailed normal mode analysis.
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Lee et al. (1998) studied this question.
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