Soret effect in forced Rayleigh scattering |
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Authors: | F. Bloisi L. Vicari P. Cavaliere S. Martellucci J. Quartieri P. Mormile G. Pierattini |
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Affiliation: | (1) Dipartimento di Fisica Nucleare, Struttura della Materia e Fisica Applicata, Università di Napoli, I-80125 Napoli, Italy;(2) Istituto di Fisica, Università di Palermo, I-90100 Palermo, Italy;(3) Dipartimento di Ingegneria Meccanica, Università Tor Vergata, I-00100 Roma, Italy;(4) Istituto di Cibernetica, C.N.R., Arco Felice, I-80125 Napoli, Italy |
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Abstract: | In forced Rayleigh scattering of mixtures or suspensions the temperature gratings generate, by the Soret effect, concentration gratings that may be very important since they produce both a phase and an amplitude grating superimposed on the principal one. The experimental evidence of their influence was given by Thyagarajan and Lallemand using a mixture of carbondisulfide and ethanol. In this paper we study the temporal behaviour of the concentration grating versus the sample properties and its effect on the detected diffracted beam. Explicit expressions are given for the output intensity taking into account both the generated amplitude and phase gratings. |
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Keywords: | 66.10.Cb 42.65.Cq 78.20.Nv |
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