Chemical and nuclear catalysis driven by localized anharmonic vibrations

Excitation of nuclear anharmonic vibrations in heavy-ion fusion reactions

We discuss the e ects of multi-phonon excitations on heavy-ion fusion reactions at energies near and below the Coulomb barrier, focusing especially on the role of anharmonicities. We carry out a systematic study of those e ects on the excitation function of the fusion cross section and on the fusion barrier distribution, by using the vibrational limit of the interacting boson model. We also ana...

Algebraic Description of Anharmonic Stretching Vibrations.

A U(2) algebraic model is presented to describe stretching vibrations of XYn (n = 2, 3, and 4) systems, where anharmonic interactions between the bond modes are considered. This model in a limit corresponds to an anharmonically coupled local-mode model. As an example, the model for a molecule XY4 is applied to recently observed spectra of methane in both gas and liquid phases, and the results o...

Axial and Torsional Free Vibrations of Elastic Nano-Beams by Stress-Driven Two-Phase Elasticity

Size-dependent longitudinal and torsional vibrations of nano-beams are examined by two-phase mixture integral elasticity. A new and efficient elastodynamic model is conceived by convexly combining the local phase with strain- and stress-driven purely nonlocal phases. The proposed stress-driven nonlocal integral mixture leads to well-posed structural problems for any value of the scale parameter...

Anharmonic thermal vibrations and disorder of atoms in tourmaline

Elbaite (space group R3m), a Li-bearing tounnaline with general fonnula of XY3Z"(B03hSi,,0,,W4, has 5 kinds of cations and 8 kinds 01'0 (including W). Of the structural studies of tourmaline, those of Gabrielle Donnay and hcr group were unique in focusing on the structural aspccts ofthc primary pyroelectricity (Donnay, 1977" etc). Donnay (1977) refined the structure of elbaite, and tound that t...

Anharmonic surface vibrations in photoemission from alkali metals.