High pressure Raman spectroscopy of H2O-CH3OH mixtures

High pressure Raman spectroscopy of H2O-CH3OH mixtures

Complex intra-molecular interactions and the hydrogen-bonding network in H2O-volatile mixtures play critical roles in many dynamics processes in physical chemistry, biology, and Earth and planetary sciences. We used high pressure Raman spectroscopy to study the pressure evolution of vibrational frequencies and bonding behavior in H2O-CH3OH mixtures. We found that the presence of low CH3OH conte...

In situ Raman spectroscopy of low-temperature/high-pressure transformations of H2O.

In situ Raman spectra of transformations of H2O as functions of pressure and temperature have been measured starting from high-density amorphous ice (HDA). Changes above Tx, the crystallization temperature of HDA, were observed. The spectra provide evidence for an abrupt, first-order-like, structural change that appears to be distinct from those associated with the transformation between low-de...

High-pressure Raman spectroscopy of graphene

John E. Proctor,1,* Eugene Gregoryanz,1 Konstantin S. Novoselov,2 Mustafa Lotya,3 Jonathan N. Coleman,3 and Matthew P. Halsall4 1School of Physics and Centre for Science at Extreme Conditions, University of Edinburgh, Edinburgh EH9 3JZ, United Kingdom 2School of Physics and Astronomy, University of Manchester, Oxford Road, Manchester M13 9PL, United Kingdom 3School of Physics, Trinity College D...

Laboratory studies of thermally processed H2O-CH3OH-CO2 ice mixtures and their astrophysical implications

Data of the Infrared Space Observatory ISO have strongly influenced the current view of interstellar ice chemistry. ISO and ground-based results have confirmed that the most abundant ice species in warm regions close to massive protostars are H2O, CO2, and CH3OH. Ice segregation in those environments reflects the extensive thermal processing of grains over the lifetime of protostars. We present...

High Performance Method for Skin Roughness Detection Using Raman Spectroscopy