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High-pressure Raman spectra of deuterated L-alanine crystal

Publikation: Bidrag til tidsskriftTidsskriftartikelForskningfagfællebedømt

  • R. O. Gonçalves
  • P. T.C. Freire
  • Nunes Bordallo, Heloisa
  • J. A. Lima
  • F. E.A. Melo
  • J. Mendes Filho
  • D. N. Argyriou
  • R. J.C. Lima

Raman spectra of deuterated L-alanine have been obtained at high-pressure conditions. A phase transition at ~1.5 GPa associated with the splitting of some internal modes and increase of the wavenumber of the external modes was observed. Similarly to the hydrogenated L-alanine crystal, this first transition was related to a symmetry change. Moreover, further modifications of the Raman spectra were observed at 4.4 GPa, which may be associated to conformational changes of the molecule. To give further support to such a hypothesis,neutron powder diffraction measurements were performed. Information about the cell parameter at atmospheric pressure gave valuable information about the N-D distances, shedding light on the behavior of the torsional vibration of ND3 +.

OriginalsprogEngelsk
TidsskriftJournal of Raman Spectroscopy
Vol/bind40
Udgave nummer8
Sider (fra-til)958-963
Antal sider6
ISSN0377-0486
DOI
StatusUdgivet - 1 aug. 2009
Eksternt udgivetJa

ID: 203939819