Coherent Raman scattering spectroscopies have been established as a powerful tool for investigating molecular systems with high chemical specificity. The existing coherent Raman scattering techniques detect only Raman active modes, which are a part of the whole molecular vibrations. Here, we report the ...
For example, in the Pm3m simple cubic perovskite, the polar F1u modes are active both in IR and HRS, while the "silent" F2u mode is active only in HRS. Here we mostly exploit the fact that hyper-Raman technique combines advantage of infrared spectroscopy to probe the polar modes ...
Therefore IR-active modes were visible in the THYR spectrum. 2. The mode T2 at 2 THz and the mode E at 5.2 THz belong to the M and A points of the Brillouin Zone, respectively. Usually, optical spectroscopies cannot detect modes far from the Γ point, because of the very small ...
Introduction Stimulated Raman scattering plays a prominent role in the resonant nonlinear spectroscopy by addressing Raman-active (and thus optically-inactive) vibrational and rotational transitions, distinguishing itself from sponta- neous Raman scattering1 by providing as reported 7 ~ 8 orders of ...
hyper-Raman active mediummonochromatic field correlationWe analysis within the quantum setting the effect of correlation of monochromatic fields of the Stokes and parametric radiation generated in a two-photon-absorbing medium by hyper-Raman scattering and four-wave mixing, respectively. Our results show...
These modes dominate the vibrational density of states in that frequency range. In the lead glass, despite a strong modification of the SiO 4 network as compared to pure silica, the results indicate that the low-frequency density of states might also be dominated by hyper-Raman active modes....
Experimental studies of hyper-Raman scattering (HRS) in inorganic oxide glasses are reported. The observation of dipole-active modes in HRS shows the strong dependence of vibrational spectra on both the value and orientation of momentum transferred to the vibrational system. The conservation of ...
Wavenumber and symmetry assignments are given for all expected 21 Raman active optical branches, except one LO component (out of the eight expected TO-LO pairs) of the polar doublet E modes. Also, the four expected hyper-Raman active A2 (TO) modes have been observed. Moreover, we have ...
The micro-hyper-Raman spectrometer opens new fields of investigation since it provides vibrational informations, on IR-active but Raman-inactive modes, at the micrometer scale. Thus, the combination of Raman and hyper-Raman methods accomplishes high spatial resolution vibrational micro-spectroscopy....
A lattice dynamics analysis of the optically active crystal vibrations based on a rigid ion model explains the observed frequencies of all optical modes satisfactorily.Y. MoriokaDepartment of ChemistryI. NakagawaDepartment of ChemistryJournal of Raman Spectroscopy...