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DEPOLARIZED RAYLEIGH SCATTERINGDEPOLARIZED RAYLEIGH AND RAMAN SCATTERING : MECHANISM OF ORIENTATIONAL MOTION IN LIQUIDS

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HAL Id: jpa-00214923

https://hal.archives-ouvertes.fr/jpa-00214923

Submitted on 1 Jan 1972

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DEPOLARIZED RAYLEIGH

SCATTERINGDEPOLARIZED RAYLEIGH AND RAMAN SCATTERING : MECHANISM OF

ORIENTATIONAL MOTION IN LIQUIDS

T. Litovitz

To cite this version:

T. Litovitz. DEPOLARIZED RAYLEIGH SCATTERINGDEPOLARIZED RAYLEIGH AND RA- MAN SCATTERING : MECHANISM OF ORIENTATIONAL MOTION IN LIQUIDS. Journal de Physique Colloques, 1972, 33 (C1), pp.C1-181-C1-181. �10.1051/jphyscol:1972133�. �jpa-00214923�

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DEPOLARIZED RA YL EIGH SCA TTERING

DEPOLARIZED RAYLEIGH AND RAMAN SCATTERING

:

MECHANISM OF ORIENTATIONAL MOTION IN LIQUIDS

T. A. LITOVITZ and I?. J. BARTOLI

Physics Department The Catholic University of America, Washington, D. C .

R6sum6. - En se servant A la fois des largeurs de raie Rayleigh et Raman, on a entrepris une ktude systematique de 15 liquides, pour dkterminer le mkanisme du processus de reorientation. On a trouve qu'on peut classer les liquides selon que la reorientation est determinke par la dynamique de la structure ou les mouvements dus aux collisions. Pour les liquides (( limitks par les collisions )) (par exemple CC14, CS2) on a obtenu le temps entre collisions ZBC en appliquant l'kquation d'Hubbard aux donnks de la diffusion de la lumi2re. Les valeurs de TBC en fonction de la tempkrature sont en bon accord avec le modde cellulaire de la structure des liquides. On sugg6re que les liquides lies par ponts hydrogkne ou par empbchement stbique (par exemple I'eau ou la nitrobenztne) posddent un processus de reorientation qui est relie de prts au temps de relaxation de structure d'un r&eau liquide.

Abstract. - Using both Rayleigh and Raman linewidths a systematic study of 15 liquids was undertaken to determine the mechanism of the reorientation process. It was found that liquids could be classified according t o whether reorientation is determined by structural dynamics or collisional motions. For cr collision limited 1) liquids (e. g. CC14, CS2) the time between collisions, TBC was obtained by applying the Hubbard equation to the light scattering data. The values of 7 B C vs tem- perature agree well with the cell model of liquid structure. It is suggested that hydrogen bonded and sterically hindered liquids (e. g. water, nitrobenzene) have areorientation process which is closely related to the structural relaxation time of the liquid lattice.

Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:1972133

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