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Dr John Proctor's Outputs (32)

High pressure Raman, optical absorption, and resistivity study of SrCrO4 (2018)
Journal Article
Hakeem, M., Jackson, D., Hamlin, J., Errandonea, D., Proctor, J., & Bettinelli, M. (2018). High pressure Raman, optical absorption, and resistivity study of SrCrO4. Inorganic Chemistry, 57(13), 7550-7557. https://doi.org/10.1021/acs.inorgchem.8b00268

We studied the electronic and vibrational properties of monazite-type SrCrO4 under compression. The study extended the pressure range of previous studies from 26 to 58 GPa. The existence of two previously reported phase transitions was confirmed at 9... Read More about High pressure Raman, optical absorption, and resistivity study of SrCrO4.

Liquid mysteries (2018)
Journal Article
Proctor, J. (2018). Liquid mysteries. Physics world, 31(5), https://doi.org/10.1088/2058-7058/31/5/37

It's easy to assume there's nothing new to learn about liquids. John Proctor explains just how weird liquids can be at high pressures and why this work could shed light on planetary interiors.

Dynamics, thermodynamics and structure of liquids and supercritical fluids : crossover at the Frenkel line (2018)
Journal Article

We review recent work aimed at understanding dynamical and thermodynamic properties of liquids and supercritical fluids. The focus of our discussion is on solid-like transverse collective modes, whose evolution in the supercritical fluids enables one... Read More about Dynamics, thermodynamics and structure of liquids and supercritical fluids : crossover at the Frenkel line.

Determining molecular orientation via single molecule SERS in a plasmonic nano-gap (2017)
Journal Article
Marshall, A., Stokes, J., Viscomi, F., Proctor, J., Gierschner, J., Bouillard, J., & Adawi, A. (2017). Determining molecular orientation via single molecule SERS in a plasmonic nano-gap. Nanoscale, 9(44), 17415-17421. https://doi.org/10.1039/c7nr05107g

In this work, plasmonic nano-gaps consisting of a silver nanoparticle coupled to an extended silver film have been fully optimized for single molecule Surface-Enhanced Raman Scattering (SERS) spectroscopy. The SERS signal was found to be strongly de... Read More about Determining molecular orientation via single molecule SERS in a plasmonic nano-gap.

Raman spectroscopy of methane (CH4 ) to 165 GPa : effect of structural changes on Raman spectra (2017)
Journal Article
Proctor, J., Maynard-Casely, H., Hakeem, M., & Cantiah, D. (2017). Raman spectroscopy of methane (CH4 ) to 165 GPa : effect of structural changes on Raman spectra. Journal of Raman Spectroscopy, 48(12), 1777-1782. https://doi.org/10.1002/jrs.5237

We have conducted a Raman study of methane (CH4), a major constituent of the outer planets, at pressures up to 165 GPa. We observe splitting of the principal Raman-active vibrational mode above 45 GPa and a nonlinear dependence of Raman peak position... Read More about Raman spectroscopy of methane (CH4 ) to 165 GPa : effect of structural changes on Raman spectra.

Theoretical and experimental study of the crystal structures, lattice vibrations, and band structures of monazite-type PbCrO4, PbSeO4, SrCrO4, and SrSeO4 (2015)
Journal Article
Errandonea, D., Munoz, A., Rodiquez-Hernandez, P., Proctor, J., Sapina, F., & Bettinelli, M. (2015). Theoretical and experimental study of the crystal structures, lattice vibrations, and band structures of monazite-type PbCrO4, PbSeO4, SrCrO4, and SrSeO4. Inorganic Chemistry, 54, 7524-7524. https://doi.org/10.1021/acs.inorgchem.5b01135

The crystal structures, lattice vibrations, and electronic band structures of PbCrO4, PbSeO4, SrCrO4, and
SrSeO4 were studied by ab initio calculations, Raman spectroscopy, X-ray diffraction, and optical-absorption measurements. Calculations properl... Read More about Theoretical and experimental study of the crystal structures, lattice vibrations, and band structures of monazite-type PbCrO4, PbSeO4, SrCrO4, and SrSeO4.