Raman scattering (RS) in CdAsa semiconducting crystals has been studied. The RS spectra have been recorded in the backscattering configuration with the i = 514.5 nm line of an ion argon laser at 50 mW output level, at room temperature. The recorded RS spectra have brought some evidence of the quasi-molecular character of the crystal lattice dynamics. The phonon modes at frequencies within the interval 180 to 270 cm-l are attributed to the arsenic atom-chain oscillations. There is some evidence of correlation splitting to occur for these high-frequcncy phonons. The modes at frequencies inferior to about 180 cm-' are attributed to the ones with important contribution of cadmium atoms and they resemble external modes in molecular crystals.La diffusion Raman (RS) dans les cristaux semiconductcurs du CdAsz a ktk ktudike. Les spectres Raman a CtC: enregist.rks en gkometrie a retrodiffusion avec la ligne 1 = 514,5 nm du laser a argon A la puissance de 50 mW et a la temphrature d'ambiance. Les spectres RS enregistrks apportaient unc certain kvidence d'un caract&re quasi-moleculair de la dynamique du rkseau de ce cristal. Les niodcs phononiques aux frCquences de l'interval 180 a 270 cm~-l sont attribuks aux oscillations des heliccs de I'arseniure. I1 y a aussi une Qvidence certaine de l'effet de correlation-splitting dam les spectres de phonons de hautes frkquences. Les modes aux frkquences inferieur B 180 cm-l sont attribuks aux modes avec une contribution importante des atoms du cadmium et ils ressemblent des modes externaux des cristaux moleculaires.
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