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Polarized Raman spectra of oriented films of α‐helical poly( L ‐alanine) and its N ‐deuterated analogue
Author(s) -
Lee SangHo,
Krimm Samuel
Publication year - 1998
Publication title -
journal of raman spectroscopy
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.748
H-Index - 110
eISSN - 1097-4555
pISSN - 0377-0486
DOI - 10.1002/(sici)1097-4555(199801)29:1<73::aid-jrs210>3.0.co;2-o
Subject(s) - raman spectroscopy , deuterium , alanine , spectral line , chemistry , reflection (computer programming) , analytical chemistry (journal) , materials science , molecular physics , optics , physics , atomic physics , amino acid , organic chemistry , computer science , programming language , biochemistry , astronomy
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 E 2 ‐species modes. Such assignments were aided by an analysis of factors that can lead to ‘cross‐talk’ between A , E 1 and E 2 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 E 2 modes in α‐PLA has led to the refinement of a new empirical force field and a more detailed normal mode analysis. © 1998 John Wiley & Sons, Ltd.