title: High pressure Raman spectroscopic study of deuterated gamma-glycine.
abstract: Raman spectroscopic investigations of deuterated gamma-glycine, carried out up to 21 GPa, indicate emergence of a new phase, which is similar to the delta-phase, reported to be formed from the undeuterated gamma-glycine at 3 GPa and the transformation to this phase is complete by 6 GPa. Observed pressure -induced variations in CD2 and N-D stretching modes indicate significant changes in the hydrogen-bonding interactions. Around approximately 15 GPa, splitting of CD2 and C-C stretching modes and discontinuous changes in the slope of CO2 and N-D stretching modes indicate another structural rearrangement across this pressure. The Raman spectra of retrieved phase at ambient conditions suggest that it may be a layered structure similar to the zeta-phase reported to be formed on decompression of the nondeuterated delta-glycine.
authors.affiliation: High Pressure Physics Division, Bhabha Atomic Research Centre, Mumbai 400 085, India.
authors.forename: Ajay K
authors.initials: AK
authors.lastname: Mishra
authors.forename: Chitra
authors.initials: C
authors.lastname: Murli
authors.forename: Surinder M
authors.initials: SM
authors.lastname: Sharma
mesh_terms: D003903:Deuterium / Q000737:chemistry*; D005998:Glycine / Q000737:chemistry*; D009584:Nitrogen / Q000737:chemistry; D011312:Pressure; D013059:Spectrum Analysis, Raman
chemical_list: D003903:Deuterium; D009584:Nitrogen; D005998:Glycine