Influence Of Static Field Research Articles

Theoretical studies of conformational analysis and intramolecular dynamic phenomena

This review reports our computational studies of a variety of topics related to conformational analyses and intramolecular dynamic phenomena. Single and double bonds, open and ring systems, and chiral molecules devoid of chiral centers (atropisomers, propellers, scorpionates, helicenes, truxenes) will be reported. Studies that followed our contributions and that are related to them will also be cited. Some curious aspects such as the absence of influence of static fields on absolute chirality, the extension of CIP rules to supramolecular systems, libration of phenyl groups, and the barrier of 1,16-dehydro[6]helicene will be discussed.

Influence of static fields and ponderomotive forces on the beam-plasma interaction

Results of theoretical investigations on the interaction of electron beams and clusters of longitudinal HF fields in a plasma are presented. A general expression to describe the energy exchange in this interaction is derived. This expression takes into account the static fields due to a plasma inhomogeneity and external forces. The problem is considered by two examples: electron beams - clusters of Langmuir oscillations interaction near electrodes and electron beam - Langmuir soliton interaction. The stationary Langmuir soliton may be pumped by the electron beam due to the presence of the electrostatic field in the cavern. The sign of the interaction depends on the space profile of the HF field.

Influence of elastic and magnetic fields on the phonon scattering and thermal conductivity of acceptor defects in cubic semiconductors

Magnetic and elastic fields have a strong influence on the phonon-scattering properties of acceptor states, which is experimentally well known from thermal conductivity measurements at low temperatures. Our theoretical approach starts with a former theory of the degenerate electronic defect states which are of the ${\ensuremath{\Gamma}}_{8}$ type. It uses high-order Green-function techniques together with unitary transformations. For the calculation of the thermal conductivity we take Callaway's formula together with a one-mode relaxation rate of the phonons. We discuss the dependence of the calculated scattering rates on physical parameters of the system. Under the influence of static fields the dynamical behavior of the electron-phonon coupling can be disturbed (e.g., resonance structures in the thermal conductivity curve can be destroyed). The changes due to those external perturbations are studied and it is shown that our theory qualitatively explains the experimental thermal conductivity results.

The influence of static fields on the dynamic Stark spectra of hydrogen Balmer lines

In plasmas, atomic-line radiation is influenced by static and high-frequency fields. The authors discuss a simple method of calculating the Stark profiles of the Balmer alpha and beta lines for the case of one-dimensional fields. Using a Holtsmark field for the static component, the resulting profile of Balmer alpha shows a splitting of the satellites.