Analysis of dispersion of long-wavelength optical phonons in zinc with thehelp of light scattering

The temperature dependences (5-300 K) of the Raman spectra of E-2g phonons and optical constants in zinc single crystals are measured in the excitatio n energy range 1.4-2.54 eV. It is found that phonon damping decreases upon an increase in the wavelength of exciting radiation. The obtained results a rc compared with the dependence of the phonon width on the excitation energ y (the probed wave vector of the excitations under investigation), which ar e presented for the first time for the transition metal osmium, as well as with the calculated electron-phonon renormalization of damping, taking into account the actual distribution of wave vectors. (C) 2001 MAIK "Nauka/Inte rperiodica".