Abstract
The optical-phonon spectrum of ZnSi${\mathrm{P}}_{2}$ has been investigated by polarized Raman scattering at 6328 \AA{}. The results are compared with phonon modes in related tetrahedrally coordinated compounds and with a set of symmetry coordinates. The low-frequency dielectric constants are estimated from the Lyddane-Sachs-Teller (LST) relation and measured refractive indices. Exciton-phonon coupling in ZnSi${\mathrm{P}}_{2}$ is discussed briefly in connection with recent luminescence measurements.
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