Lattice Dynamics of Methanol: Hydrogen Bonding and Infrared Absorption

Dempster, A.B.; Zerbi, G.

doi:10.1063/1.1675386

Cited by 81 publications

(29 citation statements)

References 25 publications

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“…A similar conclusion has also been obtained in the recent ir studies of solid CH30H. 6 It is likely that the anomalous behavior of the highfrequency internal bands is due to the proton motion present in the A-H···B hydrogen bond. In fact, Cannon 7 has proposed a mechanism which involves an increased probability of complete proton transfer across the hydrogen bond in the vibration ally excited state as a broadening mechanism of the internal band.…”

Section: Introductionsupporting

confidence: 65%

Raman Study of Hydrogen Bonding and Long-Wavelength Lattice Modes in an L-Alanine Single Crystal

Wang

Storms

1971

The Journal of Chemical Physics

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This paper presents a detailed polarization study of the Raman scattering spectrum from the lattice phonons of a single L-alanine crystal, with and without the presence of an external de electric field from 120 to 350°K. The scattering experiments were made with the incident Ar ion laser beam propagating along the 〈100〉, 〈010〉, and 〈001〉 directions of the crystal. The Raman spectra of four different scattering configurations associated with each crystal orientation were measured. The experimental results have shown the presence of a large orientational anisotropy as well as polarization anomalies in the lattice Raman spectrum of the L-alanine single crystal. By means of several different experiments (light transmission measurement, different excitation laser frequencies, temperature variations of the crystal, and de electric field study), several existing possibilities that might be associated with the polarization anomalies have been ruled out. To account for the observed effect, a picture of dynamic disorder due to the proton motion that exists within the hydrogen bond has been proposed. In addition to the spectral features associated with the lattice modes, the spectral bandwidth studies of the – NH 3 + libration and the –N–H stretching also give a result consistent with the proposed picture. Due to the nature of charge fluctuations present in a hydrogen bond, it is suggested that this phenomena should be present in all hydrogen-bonded molecular systems.

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Section: Introductionsupporting

confidence: 65%

Raman Study of Hydrogen Bonding and Long-Wavelength Lattice Modes in an L-Alanine Single Crystal

Wang

Storms

1971

The Journal of Chemical Physics

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“…In both of these phases there are infinite parallel zigzag chains of hydrogen-bonded molecules [10]. An amorphous phase can be obtained by vapour deposition at low [11]. This amorphous phase transforms into the ~ phase at 130K.…”

Section: Introductionmentioning

confidence: 98%

Optical properties of methanol at high pressures

1990

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The pressure dependence of the refractive index of methanol has been measured in a diamond-anvil cell up to 5.6 GPa at room temperature. These experiments cover the liquid phase of methanol (below 3"6GPa) as well as the 'superpressed fluid' phase above 3.6 GPa. We have extracted the polarizability of methanol from our experimental data and the equation of state by using the Lorentz-Lorenz equation.

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“…Slower freezing from the liquid state yields an orthorhombic 18 crystalline ␤ phase at higher temperature ͑157 KрTр175 K͒. A crystalline ␣ phase is formed at lower temperature, 14,15 that is probably monoclinic. 18 Applying pressure to methanol at room temperature leads, according to the general notion in the literature, 19 to formation of a glass around 8.6 GPa.…”

Section: Introductionmentioning

confidence: 99%

Competition between vitrification and crystallization of methanol at high pressure

Brugmans

Vos

1995

The Journal of Chemical Physics

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Competition between vitrification and crystallization of methanol at high pressure Brugmans, M.J.P.; Vos, W.L. General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. We have studied methanol at high pressure up to 33 GPa at room temperature with x-ray diffraction, optical ͑polarization͒ microscopy, Raman spectroscopy, and detection of hydrostaticity. A competition between crystallization and vitrification is observed when methanol is superpressed beyond the freezing pressure of 3.5 GPa: between 5.0 and 10.5 GPa crystals can nucleate, but if this region is surpassed quickly enough ͑within a few seconds͒, methanol remains amorphous. For the first time the nucleation rate and the crystal growth velocity have been studied as a function of pressure. These kinetic properties can be described by classical nucleation theory in agreement with, respectively, Turnbull-Fisher and Wilson-Frenkel type behavior using one and the same activated hard-sphere diffusion coefficient. The experimental nucleation rate and the crystal growth velocity are both effectively reduced to zero above 10.5 GPa, because the diffusion is suppressed. At these pressures methanol is compressed into a glass.

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Lattice Dynamics of Methanol: Hydrogen Bonding and Infrared Absorption

Cited by 81 publications

References 25 publications

Raman Study of Hydrogen Bonding and Long-Wavelength Lattice Modes in an L-Alanine Single Crystal

Raman Study of Hydrogen Bonding and Long-Wavelength Lattice Modes in an L-Alanine Single Crystal

Optical properties of methanol at high pressures

Competition between vitrification and crystallization of methanol at high pressure

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