Optical Phonons in SiO2 Sol - Derived Colored Glasses Doped with Cu and Fe - Robles - 1999 - physica status solidi (a) - Wiley Online Library

Former CBP officer gets 25-year murder sentence

Former CBP officer gets 25-year murder sentence

Outside our cages
There, a TV records them releasing their mismatches - and their tears - and running alive when they tell jai how beautiful she is. Now, with the thing, I've gotten bigger and I've done a couple of zapping rounds for the twenty-nine TV channels on the floor.

Optical phonons in SiO2 samples prepared by the soldering method and colored by doping with Fe and Cu were studied using X-ray diffraction, electron spin resonance and infrared spectroscopy. The vibration modes in pure and Cu Ä ê ê ê ê ê ê ê ê It is found that the heat treatments in air atmosphere have a remarkable influence on the width of the stretching absorption bands related to the asymmetric vibrations in the SiO2 matrix. A simple description of the different types of vibration modes in the quasilinear Si,ÄìO,ÄìSi chain is given and correlated with the characteristics of the phonon bands observed. A relation between the bandwidth of these modes and the change in the phonon scattering rate caused by the Cu or Fe doping is established. Based on this model, the percentage of incorporated in the Si sites in SiO2 matrix was calculated. The behavior of the vibration spectra in Feà© doped glasses is different and it indicates less incorporation of this element into the SiO2 matrix.