Closed-orbit theory gives a semiclassical formula for the photoabsorption oscillator strength density of atoms in external fields. The oscillator strength can be calculated from the properties of the classical orbits of the highly excited electron moving in the combined Coulomb and electric field. The deviation from the Coulomb potential due to an alkali-metal atom core causes scattering betwee...

The dynamics of a proposed microelectromechanical system (MEMS) consisting an array limit cycle oscillators (LCOs) are analyzed. LCOs have dissimilar frequencies and coupled in nearest-neighbor configuration via electrostatic fringing fields. emergence synchrony the is outlined for two cases: self-synchronization to single frequency, entrainment external inertial drive. Numerical analysis used ...

Optical properties of polystyrene in the form of thin films were determined for photon energies between 0.6 and 82 eV from transmission measurements. The results for k, the extinction coefficient, were combined with previous experimental results in the soft and hard x-ray regions up to 8050 eV. Analyses were made on several sum rules for the optical properties in this unusually wide energy rang...

We report the absorption cross-section of colloidal InAs quantum dots of mean radii from 1.6 to 3.45 nm. We find excellent agreement between the measured results and calculated values based on a model of small-particle light absorption. The absorption cross-section per dot is 6.2 x 10(-16)R(3) cm(2) at 2.76 eV and 3.15 x 10(-16)R(1.28) cm(2) at the first-exciton absorption peak, with the dot ra...

This paper aims at proposing a measure of speech rhythm based on the inference of the coupling strength between the syllable oscillator and the stress group oscillator of an underlying coupled oscillators model. This coupling is inferred from the linear regression between the stress group duration and the number of syllables within the group, as well as from the multiple linear regression betwe...

Oscillator-strength sum rule in light-induced transitions is one general form of quantum-mechanical identities. Although this sum rule is well established in equilibrium photo-physics, an experimental corroboration for the validation of the sum rule in a nonequilibrium regime has been a long-standing unexplored question. The simple band structure of graphene is an ideal system for investigating...

Far-infrared spectra of ferrimagnetic Dy3Fe5O12 single crystals have been studied in the spectral range between 12 and 700 cm−1 and in a wide temperature range between 5 K and 300 K using transmission spectroscopy and rotating analyzer ellipsometry. In the temperature range below TC = 16 K for the magnetic ordering of Dy3+ spins, a number of ligand field and Kaplan-Kittel (KK) exchange resonanc...

Zhifan Chen and Alfred Z. Msezane Center for Theoretical Studies of Physical Systems, and Department of Physics Clark Atlanta University, Atlanta, Georgia 30314, U. S. A. ABSTRACT Generalized oscillator strengths (GOS’s) for the Na 3s−3p transition have been investigated using the spin-polarized technique of the random phase approximation with exchange (RPAE) and the first Born approximation (F...

We consider a degenerate optical parametric oscillator containing a left-handed material. We show that the inclusion of a left-handed material layer allows for controlling the strength and sign of the diffraction coefficient at either the pump or the signal frequency. Subsequently, we demonstrate the existence of stable dissipative structures without diffraction matching, i.e., without the usua...