Scissors modes: The first overtone

Scissors modes: The first overtone

Scissors modes were predicted in the framework of the two-rotor model. This model has an intrinsic harmonic spectrum, so that the level above the scissors mode, the first overtone, has excitation energy twice that of the scissors mode. Because the latter is of the order of 3 MeV in the rare-earth region, the energy of the overtone is below threshold for nucleon emission, and its width should re...

Scissors modes in crystals with cubic symmetry

We recently suggested that the Scissors Mode (a collective excitation in which one system rotates with respect another one conserving its shape) can occur in crystals with axially symmetric atoms as a precession of these atoms around the anisotropy axis of their cells, giving rise to a form of dichroism. In the present paper we investigate how the Scissors Mode can be realized in crystals with ...

Overtone Bands of H3f: First Principle Calculations

Since its spectrum was first observed by Oka (I) and Shy et al. (2) in 1980, H: and its isotopomers have excited considerable interest among experimental spectroscopists and theoretical chemists alike. All the infrared-allowed fundamentals of the ions have been characterized (3-8). The microwave spectrum of H2D+ has tentatively been observed in the interstellar gas cloud NGC 2264. At the same t...

Hydrodynamical Survey of First Overtone Cepheids

A hydrodynamical survey of the pulsational properties of first overtone Galactic Cepheids is presented. The goal of this study is to reproduce their observed lightand radial velocity curves. The comparison between the models and the observations is made in a quantitative manner on the level of the Fourier coefficients. Purely radiative models fail to reproduce the observed features, but convect...

Quartz-enhanced photoacoustic spectroscopy exploiting tuning fork overtone modes