Femtosecond time-resolved investigation of the vibrational modes of vitreous GeO2
Résumé
The vibrational response of vitreous GeO2 is investigated using an impulsive stimulated Raman scattering technique in the femtosecond regime. The results yield evidence for a weak vibrational mode ascribed to oxygen motion in three-membered planar ring structures. Its frequency and damping are determined and compared to theoretical predictions.