Details

Autor(en) / Beteiligte

• Melo, W.D.C.
• Freire, P.T.C.
• Filho, J. Mendes
• Melo, F.E.A.
• Lima, J.A.
• Paraguassu, W.

Titel

Raman spectroscopy of d-methionine under high pressure

Ist Teil von

• Vibrational spectroscopy, 2014-05, Vol.72, p.57-61

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2014

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• [Display omitted] •d-Methionine crystal was submitted to high pressure conditions.•d-Methionine undergoes two pressure induced phase transitions.•Based on the Raman spectrum the new phases of d-methionine are suggested. In this work the vibrational properties of d-methionine crystal submitted to high pressure were investigated through Raman spectroscopy. The measurements covered the pressure range from 0.0 to 7.0GPa. From the analysis of the spectra we were able to identify two reversible pressure induced phase transitions: the first at 2.0GPa and the second at 2.5GPa. The three phases are characterized by different number of peaks associated with the rocking of (CO2−) and with the stretching of CSC, among others. A comparison between the behavior of d-methionine and l-methionine under high pressure is furnished as well as a discussion about the symmetries of the crystal in the two high pressure phases.