In forced Rayleigh scattering of mixtures or suspensions the temperature gratings generate, by 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 esperimental evidence of their influence was given by Thyagarajan and Lallemand using a mixture of carbondisulfide and ethanol. In this paper we study the temporal bahaviour 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.
Soret Effect In Forced Rayleigh-scattering / Bloisi, Francesco; Vicari, LUCIANO ROSARIO MARIA; P., Cavaliere; S., Martellucci; J., Quartieri; P., Mormile; G., Pierattini. - In: APPLIED PHYSICS. B, PHOTOPHYSICS AND LASER CHEMISTRY. - ISSN 0721-7269. - STAMPA. - 44:(1987), pp. 103-106. [10.1007/BF00694201]
Soret Effect In Forced Rayleigh-scattering
BLOISI, FRANCESCO;VICARI, LUCIANO ROSARIO MARIA;
1987
Abstract
In forced Rayleigh scattering of mixtures or suspensions the temperature gratings generate, by 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 esperimental evidence of their influence was given by Thyagarajan and Lallemand using a mixture of carbondisulfide and ethanol. In this paper we study the temporal bahaviour 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.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
