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Träfflista för sökning "WAKA:ref ;lar1:(cth);srt2:(1970-1979);srt2:(1974)"

Sökning: WAKA:ref > Chalmers tekniska högskola > (1970-1979) > (1974)

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  • Davidsson, A., et al. (författare)
  • New details in the polarized spectrum of naphthalene by means of linear dichroism studies in oriented polymer matrices
  • 1974
  • Ingår i: Chemical Physics Letters. - : Elsevier BV. - 0009-2614. ; 28:2, s. 221-224
  • Tidskriftsartikel (refereegranskat)abstract
    • Linear dichroism (LD) spectra are presented for naphthalene oriented in stretched polyethylene and polypropylene matrices at 77 K and 296 K. From the calculated spectrum LD(λ)/A(λ), where A(λ) is the corrected absorbance spectrum of the sample by unpolarized light, orientational parameters are calculated and component spectra, 235–315 nm, are resolved corresponding to polarization parallel to the long (B3u = x) and the short (B2u = y) axes in the molecular plane (D2h). The orientational parameters indicate different orientational mechanisms in polyethylene and polypropylene, but the resolving procedure yields mainly identical component spectra. It is suggested that the polarization (B3u) predominating in the 245–275 nm region isdue to a B1g vibronic perturbation of the 1B2u state.
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  • Larsson, Kenneth, et al. (författare)
  • Methanolysis of galacturonic acid
  • 1974
  • Ingår i: Carbohydrate Research. ; 34, s. 323-329
  • Tidskriftsartikel (refereegranskat)abstract
    • Dimethyl acetals of galacturono-6,3-lactone and methyl galacturonate are formed during methanolysis of galacturonic acid. The products of methanolysis were studied by ion exchange and gas chromatography. Trimethylsilyl (TMS) derivatives were used in gas chromatography. Structure determinations were made from mass spectra of the TMS derivatives. The course of methanolysis was investigated by means of a gas chromatographic study of the composition of the reaction mixture as a function of time.
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