Densification effects on the Boson peak in vitreous silica: A molecular-dynamics study

We perform classical molecular-dynamics simulation to study the effect of d ensification on the vibrational spectrum of a model silica glass. We concen trate this study on the so-called Boson peak and compare our results, obtai ned from a direct diagonalization of the dynamical matrix, with experimenta l Raman data. We show that, upon densification, the position of the Boson p eak shifts towards higher frequencies while its magnitude decreases which i s in agreement with a recent experimental study. (C) 2000 American Institut e of Physics. [S0021-9606(00)50431-0].