François Romain

TL;DR: In this paper, the Raman spectra of polycrystalline samples of CH3NH3PbCl3 were studied at temperature ranging from 80 K to 300 K and an assignment of most of the observed bands was proposed.

TL;DR: In this article, a correlation between water uptake and nominal V o s concentration was established, but the nature of the alkaline earth metal atom influences the oxygen sublattice: Ba 6 Nb 2 O 11 (V o s ) 1 has zero water uptake.

TL;DR: In this article, the infrared and Raman spectra of powdered crystals at various temperatures from liquid helium to 300 K of fully hydrogenated benzoic acid, ring deuterated ðBA-d5hÞ and OD OD-h5dÞ analogues are presented, and a theory based on uncorrelated transfer of protons via thermally activated tunnelling to account for the interconversion dynamics is proposed.

TL;DR: The Raman spectra of the high temperature superionic phase of CsH 2 PO 4 were investigated in the 4000-20 cm −1 range as discussed by the authors, and no irreversible phase transition was observed near 504 K.

TL;DR: In this paper, an assignment of bands in terms of OH group frequencies and more or less distorted tetrahedra of ammonium and sulphate ions is given, and the crystallographic and spectroscopic symmetry and/or dissymetry of OH⋯O hydrogen bonds linking sulphate ion into dimers are discussed using the splitting of the v1 Raman bands as criteria.