Dipolar behaviour of molecular fluids up to the critical point

Gerschel, A.; Darmon, I.; Brot, C.

doi:10.1080/00268977200100321

Cited by 61 publications

(5 citation statements)

References 16 publications

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“…The parameters used in the simulation are given in Table . Chloroform is best described as having contributions from two damped, driven collective oscillators . One is highly overdamped, resulting in nearly Debye-type behavior.…”

Section: Time-resolved Studiesmentioning

confidence: 99%

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Terahertz Spectroscopy

2002

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Terahertz spectroscopy emerged about 13 years ago with the demonstration that nearly single-cycle pulses of far-infrared radiation could be generated, propagated through free space, and subsequently detected in the time-domain. Since then, THz spectroscopy has found widespread applicability with studies ranging from condensed matter physics to gas-phase spectroscopy to biomedical imaging. In this article, the properties and applications of THz spectroscopy are described in the context of work being done in the Schmuttenmaer labs at Yale University. In particular, it is shown that an optical pump-THz probe configuration can elucidate phenomena such as the response of low-frequency collective solvent modes in liquids, and transient photoconductivity in a variety of semiconductor systems, such as bulk GaAs, low-temperature grown GaAs, nanocrystalline colloidal TiO 2 , and CdSe quantum dots. In addition, recent experiments measuring charge transfer in a very direct manner are discussed.

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Section: Time-resolved Studiesmentioning

confidence: 99%

“…Chloroform is best described as having contributions from two damped, driven collective oscillators. 83 One is highly overdamped, resulting in nearly Debye-type behavior. The other is slightly underdamped, and is responsible for the peak at 42 cm -1 .…”

Section: Time-resolved Studiesmentioning

confidence: 99%

Terahertz Spectroscopy

2002

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“…They report a rather low value for zinc oxide single crystals (@ = 0.01 -0.03) though theory predicts high values (@ -1.00 [4]). Yamase et al [8,9] discussed the possibility that surface states acting as recombination centers may reduce the sensitization efficiency. In 1979 Spitler et al [lo] determined the absorption of dye molecules adsorbed on zinc oxide single crystals by attenuated total reflection technique (ATR).…”

Section: Effect Of Surface Hydrolysis At Tin Dioxide Polycrystalline Thin Film Electrodes On Dye Sensitization Quantum Efficiency Burkharmentioning

confidence: 99%

Effect of Surface Hydrolysis at Tin Dioxide Polycrystalline Thin Film Electrodes on Dye Sensitization Quantum Efficiency

Bressel

Gerischer

1983

Ber Bunsenges Phys Chem

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The quantum efficiency of dye sensitization at polycrystalline SnO2 thin films can reach a high value close to ϕ = 1 if determined immediately after preparation, however it slowly drops down to low values (ϕ ∼ 0.01) after inserting the electrode into aqueous electrolyte solutions. The quantum efficiency decay rate depends on the electrolyte composition. Capacitance and cyclic voltammetry measurements indicate the formation of an insulating layer. Auger‐ and IR‐reflection spectra have been used to identify this layer as a mixed oxide/hydroxide formed by hydrolysis of the surface oxide. This layer acts as an energy barrier for the injection current from the excited dye molecule thus decreasing the sensitization quantum efficiency.

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“…If we replace (w 2 )112 with nk, where k is an arbitrarily chosen constant and n =(W 2 )1/2/k, cp (0 becomes cp(t)=exp{-[l(e-nktlr_l)+ynkt]). (18) If one defines reduced time units t* =nt, cp(t) will then become cp (t*) =exp{ -[y2 (e-kt * Ir -1) +ykt*]} ,…”

Section: B Vibrational Relaxationmentioning

confidence: 99%

“…2 ,4,5,12-14 Rotational motion and collision-induced effects in neat liquid OCS under its own vapor pressure were the subject of an early far IR study. 17,18 Vibrational relaxation of the III mode of OCS in n-alkanes has also recently been studied. 3 To the best of our knowledge, no previous work on vibrational relaxation or collision-induced effects in Raman scattering of neat liquid OCS has been reported.…”

Section: Introductionmentioning

confidence: 99%

Reorientational motion, collision-induced scattering, and vibrational relaxation in liquid carbonyl sulfide

Hegemann

Jonáš

1983

The Journal of Chemical Physics

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Articles you may be interested inThe effects of vibrational mode and collision energy on the reaction of formaldehyde cation with carbonyl sulfide Dynamics of molecular reorientational motion and vibrational relaxation in liquids. ChloroformThe rotational and vibrational behavior of neat liquid carbonyl sulfide under its own vapor pressure is investigated through Raman line shape studies of the symmetric v I C = S stretching mode over the temperature range T = 183 to 303 K. The reorientational motion is found to be near the diffusional limit. Various methods of determining the reorientational correlation time 'To are compared and their validity discussed. The contribution of collision-induced scattering to the v I mode rotational line shape is examined semiquantitatively. It is found that the relative contribution of collision-induced scattering to the overall rotational line shape increases with increasing temperature and decreasing density, whereas the second moment of the collision-induced line shape decreases. Assuming the separability of the collision-induced scattering contribution and the reorientational contribution to the observed line shape, the experimental data are discussed qualitatively in terms of the dipole-induced-dipole (DID) theory of Balucani and Vallauri. The vibrational relaxation mechanism for the v I mode is attributed to dephasing and interpreted by Kubo line shape theory. The dephasing is found to be in the "motionally narrowed" regime and discussed qualitatively in terms of attractive dipolar forces.

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Dipolar behaviour of molecular fluids up to the critical point

Cited by 61 publications

References 16 publications

Terahertz Spectroscopy

Terahertz Spectroscopy

Effect of Surface Hydrolysis at Tin Dioxide Polycrystalline Thin Film Electrodes on Dye Sensitization Quantum Efficiency

Reorientational motion, collision-induced scattering, and vibrational relaxation in liquid carbonyl sulfide

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