Dielectric dispersion in pure polar liquids at very high radio-frequencies I. Measurements on water, methyl and ethyl alcohols

The results are given of some measurements of the absorption coefficient and refractive index of water, methyl and ethyl alcohols at wave-lengths of 6·2 mm, 1·24 cm and 3·21 cm over the temperature range —10 to 50°C, including some observations on water in the supercooled state. The method used is based upon the fact that the rate of attenuation of radio-frequency energy along a wave-guide filled with the liquid is dependent upon both the absorption coefficient and the refractive index when the guide is operated near to the cut-off condition. The electrical characteristics of water vary in a continuous manner through the normal freezing-point of 0°C down to at least —8°C. The measurements indicate that both alcohols, like water, have relatively high atomic polarizations.

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Dielectric dispersion in pure polar liquids at very high radio-frequencies II. Relation of experimental results to theory

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1952.0139 ◽

1952 ◽

Vol 213 (1115) ◽

pp. 473-492 ◽

Cited By ~ 84

Keyword(s):

Relaxation Time ◽

Viscous Flow ◽

Frequency Factor ◽

Dielectric Dispersion ◽

Resonance Absorption ◽

Millimetre Wave ◽

Polar Liquids ◽

Single Relaxation Time ◽

Observed Behaviour ◽

Very High

The results of the measurements at centimetre and millimetre wave-lengths on the dielectric properties of water, methyl alcohol and ethyl alcohol described in part I are analyzed. There is no evidence that, for any of these liquids, more than a single relaxation time as a function of temperature is required to account for the dispersion arising from dipole rotation. It is suggested that the observed behaviour of the two alcohols at wave-lengths near to 1 cm, which appears not to conform with the hypothesis of a single relaxation time, is in fact the consequence of resonance absorption. If it is supposed that in dipole rotation and viscous flow the molecules have to surmount potential energy barriers, then it appears that, in each of the liquids examined, the heights of the barriers concerned in the two processes are identical; but the ‘frequency factor’ associated with such processes is much larger for viscous flow than for dipole rotation.

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Effect of radio frequency plasma treatment on the nonlinear refractive index and absorption coefficient of red lake doped polyvinyl chloride film

Optical and Quantum Electronics ◽

10.1007/s11082-014-0076-z ◽

2014 ◽

Vol 47 (7) ◽

pp. 2027-2038 ◽

Cited By ~ 2

Author(s):

Davoud Dorranian ◽

Yasaman Golian

Keyword(s):

Refractive Index ◽

Absorption Coefficient ◽

Radio Frequency ◽

Plasma Treatment ◽

Polyvinyl Chloride ◽

Nonlinear Refractive Index ◽

Radio Frequency Plasma ◽

Red Lake ◽

Frequency Plasma ◽

Chloride Film

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Dielectric dispersion in pure polar liquids at very high radio frequencies - III.The effect of electrolytes in solution

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1952.0187 ◽

1952 ◽

Vol 214 (1119) ◽

pp. 531-545 ◽

Cited By ~ 68

Keyword(s):

Sodium Chloride ◽

Ionic Conductivity ◽

Aqueous Solutions ◽

Methyl Alcohol ◽

Dielectric Dispersion ◽

Basic Theory ◽

Polar Liquids ◽

Polar Dielectric ◽

Radio Frequencies ◽

Very High

A description is given of measurements at millimetre and centimetre wave-lengths of absorption in electrolytic solutions, up to concentrations of about 3 normal, with water and methyl alcohol as solvents. The observations are analyzed in terms of Debye’s basic theory of dispersion in a polar dielectric, and it is shown what modifications to the theory are necessary to take account of the ionic conductivity produced by an electrolyte. Measurements on aqueous solutions of sodium chloride are discussed in relation to Hückel’s theory of electrolytic solutions.

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