NDLI: High frequency dynamics of liquid methanol and toluene. Contribution of molecular rotational diffusion to inelastic neutron scattering

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Glass and other relaxations in liquids

Dielectric study of the motion of molecules in the supercooled liquid state

Dielectric properties of glycerol in the range 0.1–10⁵ Hz, 218–357 K, 0–53 kb

General discussion ( Faraday Symposia of the Chemical Society Vol -6 )

Rotational diffusion in para-azoxyanisole

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Molecular motions in liquids: comparison of light scattering and infra-red absorption

Environmental fluctuations and rotational processes in liquids

General discussion ( Faraday Symposia of the Chemical Society Vol -6 )

Interpretation of dipole correlation functions in some liquid systems

Molecular acoustics. Part 8.—Conformational changes in heterocyclic molecules studied by the ultrasonic method

General discussion ( Faraday Symposia of the Chemical Society Vol -6 )

Molecular motions in simple liquids

Molecular dynamics of liquids in relation to the solid and gas phases as seen by neutron scattering

High frequency dynamics of liquid methanol and toluene. Contribution of molecular rotational diffusion to inelastic neutron scattering

General discussion ( Faraday Symposia of the Chemical Society Vol -6 )

Motional broadening of the quasi-elastic peak in neutrons scattered from polymeric materials

Study of molecular motion in solutions of biopolymers using nuclear magnetic resonance

Mechanical techniques for studying viscoelastic relaxation processes in polymer solutions

General discussion ( Faraday Symposia of the Chemical Society Vol -6 )

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High frequency dynamics of liquid methanol and toluene. Contribution of molecular rotational diffusion to inelastic neutron scattering

Content Provider	Royal Society of Chemistry (RSC)
Author	Aldred, B. K. Stirling, G. C. White, J. W.
Copyright Year	1972
Abstract	Both molecular rotational and translational diffusion may contribute to the spectra of molecular liquids measured by incoherent inelastic neutron scattering, (i.n.s.), especially in the “quasielastic” scattering region. Some experiments on two, quite different, molecular liquids, methanol (CH3OH) and toluene (CH3 . C6H5) are presented here to assess the extent to which rotational diffusion and whole molecule rotation interfere with quasi-elastic measurements of centre of mass diffusion, in the light of Larsson's recent theories. Isotopic substitution, previously introduced to help assign contributions to i.n.s. from intramolecular motions, is again found to be a valuable technique for studying the external rotations. Toluene and methanol have rather different moments of intertia and barriers to internal rotation. While the inertial effects of substitution are relatively small (except for the CH3 group motions) the effects produced by the various deuterium permutations on the cross-sections for rotational diffusion scattering vary greatly in the two systems.Deuterium substitution of the CH3 group in methanol allows a reliable measurement of the centre of mass diffusion of the molecule on the neutron scattering time scales (10–11 s-10–12s) with present time of flight spectrometer resolutions (∼ 10%ΔE/E at E0= 23 cm–1). No evidence for intermolecular proton transfer in pure methanol was found.For toluene the moment of inertia distribution is such that rotational contributions cannot be completely eliminated by deuterium substitution. Dynamical models have been made to investigate the inelastic rotational scattering in the methanol i.n.s. spectrum and some more refined computing methods for fitting quasi-elastic scattering spectra, in cases susceptible to simple diffusion analysis, are given.
Starting Page	135
Ending Page	160
Page Count	26
File Format	PDF
ISSN	03015696
Volume Number	6
Journal	Faraday Symposia of the Chemical Society
DOI	10.1039/FS9720600135
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Larsson Diffusion Neutron diffraction Methanol Toluene Henrik Larsson Deuterium Spectrometer Hydrogen
Content Type	Text
Resource Type	Article

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