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Measurement-Induced Collective Vibrational Quantum Coherence under Spontaneous Raman Scattering in a Liquid

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First principles vibrational spectra of tetrahedrally-bonded glasses

Luigi Giacomazzi

Disordered oxides, such as vitreous silica (v-SiO2) and vitreous germania, (v-GeO2) and chalcogenide glasses, such as vitreous germanium diselenide (v-GeSe2) are currently key materials in many technological fields, ranging from Si-based microelectronic to ...

EPFL2007

We analyze the principal vibrational spectra of vitreous GeO2 and derive therefrom structural properties referring to length scales beyond the basic tetrahedral unit. We generate a model structure that yields a neutron structure factor in accord with exper ...

2005

Raman spectra of disordered oxides from first principles

Paolo Umari

This thesis is devoted to the study of Raman scattering from first-principles. We develop two different methods to calculate Raman spectra of large model structures. The first method concerns the extension of the perturbative variational approach for the c ...

EPFL2003

Raman and fluorescence spectra of size-selected, matrix-isolated C14 and C18 neutral carbon clusters

The surface plasmon polariton-enhanced Raman spectra of size-selected, matrix-isolated C14 neutral clusters are presented along with the calculated vibrational frequencies for the ring and linear chain isomers. The Raman spectra show resonance enhancement ...

2001

Raman spectra and calculated vibrational frequencies of size-selected C16, C18, and C20 clusters

The surface plasmon polariton-enhanced Raman spectra of size-selected C16, C18, and C20 clusters isolated in nitrogen matrices are presented along with the calculated vibrational frequencies for the ring and linear chain isomers. The Raman spectra, recorde ...

1998

Raman spectroscopic study of structural changes in calcium aluminate (CaAl2O4) glass at high pressure and high temperature

Philippe Gillet

The Raman spectrum of calcium aluminate (CaAl2O4) glass has been obtained as a function of pressure at ambient temperature to similar to 15 GPa, and as a function of temperature at room pressure to 1650 K. On increasing pressure at 300 K, the Raman spectru ...

1996

High-temperature Raman spectroscopic and X-ray diffraction study of beta-Mg2SiO4: Insights into its high-temperature thermodynamic properties and the beta- to alpha-phase-transformation mechanism and kinetics

Philippe Gillet

We performed in-situ Raman spectroscopy and X-ray diffraction experiments at high temperature and ambient pressure to investigate the intrinsic anharmonic properties of beta-Mg2SiO4 and the mechanism and kinetics of its back-transformation to forsterite. H ...

1996

The infrared and Raman spectra of CaCO3 calcite substituted with 80% O-18 have been recorded. A detailed mode assignment is proposed for all the observed bands, including combinations and overtones. These data are used to propose a simplified model of the ...

1996

An In-Situ High-Temperature Structural Study Of Stable And Metastable Caal2Si2O8 Polymorphs

Philippe Gillet

High-temperature Raman spectroscopy and optical microscopic observations have revealed a new metastable polymorph of CaAl2Si2O8 composition, which brings to four the number of known crystalline phases in this system. Similar to the metastable monoclinic ps ...

1995

Raman spectra of Mg2GeO4-olivine were obtained from ambient pressure up to 34 GPa at ambient temperature. Under quasi-hydrostatic pressure conditions, the following modifications in the Raman spectra occur as pressure increases: 1) near 11 GPa, two sharp e ...

1994