Abstract
In the presence of an external electric field, certain Raman-active vibration modes in diamond-type crystals also become infrared active, giving rise to an absorption proportional to the first-order change in the electronic polarizability per unit cell with the relative displacement of atoms, $\frac{\ensuremath{\partial}\ensuremath{\alpha}}{\ensuremath{\partial}u}$. We have observed such a transmission minimum and from its characteristics we have determined the electric-field-induced effective ionic charge and $\frac{\ensuremath{\partial}\ensuremath{\alpha}}{\ensuremath{\partial}u}$.
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