High frequency rotational mode in liquid methyl chloride

Gerschel, A.; Grochulski, T.; Kisiel, Zbigniew; Pszczółkowski, L.; Leibler, K.

doi:10.1080/00268978500100081

Cited by 30 publications

(12 citation statements)

References 24 publications

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“…Our observations on hexanone-2 are in qualitative agreement in the microwave and the interm ediate region with those made by Gerschel et at. (1985) on methyl chloride in the pure liquid form.…”

Section: Cx{t) C(0 )supporting

confidence: 92%

“…One would therefore again expect a significant absorption for methyl chloride in the intermediate frequency region. This intermediate frequency absorption has been observed by Gerschel et al (1985) and has been examined in detail by Corcoran & Vij (1987).…”

Section: Cx{t) C(0 )supporting

confidence: 54%

“…From recent measurements on acetonitrile and hexanone-2 and from the literature (details in Vij & Hufnagel 1985;Gerschel et al 1985) it is evident th a t the fir loss peak is caused by strongly damped librational motion. Recently (Coffey et al 1986) we have shown how the fix = experimental data closely.…”

Section: O N M a T C H In G T H E M O D E L To E X P E R I M E N Tmentioning

confidence: 99%

“…We will tre a t in particular the technique used for (a), for frequencies between the fir and mw regions. Measurements in this spectral region have only become possible recently (see Gerschel et al 1985).…”

Section: E X P E R I M E N T a L M E T H O D Smentioning

confidence: 99%

“…The d ata were obtained in the frequency range 150 GHz-1 THz with Im p a tt diode oscillators a t 150 and 300 GHz (Vij & Hufnagel 1985) and a molecular laser as a source ) in the frequency range 300 GHz-4.6 THz. The frequency range 150 GHz-1 THz lies between the microwave and the fir region (termed the interm ediate frequency region by Gerschel et al 1985). One would expect th a t any effe crossing (Debye 1929, ch.…”

Section: Cx{t) C(0 )mentioning

confidence: 99%

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On the role of inertial effects and dipole-dipole coupling in the theory of the Debye and far-infrared absorption of polar fluids. II. Comparison with experimental observations

Coffey

Corcoran

Vij

1987

Proc. R. Soc. Lond. A

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A general two-friction itinerant-oscillator model is given for molecular motion in dipolar fluids. The polarizability and relevant time-correlation functions are calculated by numerical methods. It is shown how the results of an earlier paper are obtained when the two frictions per unit inertia are equal. The model is compared with recent experimental measurements on hexanone-2 and acetonitrile obtained by using a new quasi-optical technique for frequencies intermediate between the MW and FIR spectral regions. This technique is described briefly; in particular, for a reasonable fitting of the theory to experiment the moment of inertia of the outer cage of molecules is always greater than that of the inner dipole in agreement with the original concept, namely a cage of dipoles surrounding a typical dipole. This is at variance with the earlier concept of the model where the friction on the encaged dipole is zero. There, for a good fit to experiment, the moment of inertia of the cage is always less than that of the dipole. This suggests that the two friction version should be used for such comparison. An analytical formula (analogous to the Rocard equation) for the polarizability derived earlier is shown to agree well with the result of numerical Fourier transformation of the response function. A distinct harmonic peak structure is noted in the FIR region of the spectrum when friction does not act on the inner dipole. The structure is damped out as this friction is increased. Thus only the first harmonic peak is significant when the frictions per unit inertia are approximately equal. Measurements in the frequency region (the intermediate region) lying between the microwave and the FIR for hexanone-2 in dilute solutions of cyclohexane are reported. These show a significant excess absorption over that predicted by the model in this region. It is suggested that the excess absorption arises from jumping of dipoles from well to well of the cosine potential of dipole-dipole interaction indicating that the effects of finite potential well depth must be incorporated in the model to explain the intermediate frequency absorption.

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Section: Cx{t) C(0 )supporting

confidence: 92%

Section: Cx{t) C(0 )supporting

confidence: 54%