Millimeter and submillimeter laser spectroscopy of water

Vij, J. K.; Hufnagel, F.

doi:10.1016/0009-2614(89)85340-0

Cited by 28 publications

(11 citation statements)

References 11 publications

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“…Condensed water has a weak absorption in the low-frequency range which has been assigned to the "librational modes of structural aggregates of clustered molecules". 32,33,34 No such signal is expected in the present experimental results because the small amount of water is adsorbed on a large surface (∼ 300 m 2 /g) so no such aggregates are possible.…”

Section: Infrared Measurementmentioning

confidence: 52%

Far-Infrared Absorption by Acoustic Phonons in Titanium Dioxide Nanopowders

Murray¹,

Netting²,

Saviot³

et al. 2006

Journal of Nanoelectronics and Optoelectronics

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We report spectral features of far infrared electromagnetic radiation absorption in anatase TiO2 nanopowders which we attribute to absorption by acoustic phonon modes of nanoparticles. The frequency of peak excess absorption above the background level corresponds to the predicted frequency of the dipolar acoustic phonon from continuum elastic theory. The intensity of the absorption cannot be accounted for in a continuum elastic dielectric description of the nanoparticle material. Quantum mechanical scale dependent effects must be considered. The absorption cross section is estimated from a simple mechanical phenomenological model. The results are in plausible agreement with the absorption being due to a sparse layer of charge on the nanoparticle surface.

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Section: Infrared Measurementmentioning

confidence: 52%

Far-Infrared Absorption by Acoustic Phonons in Titanium Dioxide Nanopowders

Murray¹,

Netting²,

Saviot³

et al. 2006

Journal of Nanoelectronics and Optoelectronics

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“…Nevertheless it must be noticed that this low frequency band is barely visible in the experimental spectrum the authors detecting it either at 30 cm -1 (Ref. 10) or at 50 cm -1 (Ref. 8) and' virtually disappearing above 303 K (see the scattering of the experimental values in Fig.…”

Section: (A 3 )] We Obtainmentioning

confidence: 93%

A molecular dynamics study of the far infrared spectrum of liquid water

Guillot¹

1991

The Journal of Chemical Physics

185

113

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The far infrared spectrum of liquid water at room temperature is calculated by molecular dynami~s s~mulat.ion over the spectral range 0.5-1000 cm -1. It is shown that the experimental absorptl.on l?tenslty c.an be ~eproduced satisfactorily provided that the dipole induced dipole mechamsm IS convemently Implemented in the calculation and the classical profile corrected ~or quantum effects. The contribution due to exchange overlap dipoles between 0 and H atoms IS also investiga~ed b~t its role ~n the genesis of the far infrared (FIR) spectrum is negligible. Although the dipole mduced dipole (DID) mechanism is found to be responsible for the peculiar band shape near 200 cm -1 by revealing the intermolecular oscillations of the hydrogen bond network, no other translational band is detected in the region 10-60 cm -1, a result in contradistinction with data put forward recently. Moreover, it is shown that the a~sorption spectrum is the seat of various cancellation effects between permanent and induced dIpoles, effects which are described in detail.

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“…Vij and Hufnagel [33] have observed in the power absorption coefficient of water a broad shoulder centered at 30 cm-~, and assigned it to the librational modes of clustered molecules in condensed water. Vij and Hufnagel [33] have observed in the power absorption coefficient of water a broad shoulder centered at 30 cm-~, and assigned it to the librational modes of clustered molecules in condensed water.…”

Section: Resultsmentioning

confidence: 99%

Water clusters: the (H2O)64 case

Farantos

1994

Z Phys D - Atoms, Molecules and Clusters

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Minimum energy structures and dynamics of (H20)64 cluster are investigated by molecular dynamics techniques and an empirical potential energy surface. Using plots of the cluster, the oxygen-oxygen distance distribution function, and power spectra, we show the existence of minima with deformed cubic arrangement. These results together with previous calculations on smaller clusters support the conclusion that the cubic type geometries are common among water aggregates.

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Millimeter and submillimeter laser spectroscopy of water

Cited by 28 publications

References 11 publications

Far-Infrared Absorption by Acoustic Phonons in Titanium Dioxide Nanopowders

Far-Infrared Absorption by Acoustic Phonons in Titanium Dioxide Nanopowders

A molecular dynamics study of the far infrared spectrum of liquid water

Water clusters: the (H2O)64 case

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