SPECTROSCOPY OF MULTIELECTRON ATOM IN DC ELECTRIC FIELD: RELATIVISTIC OPERATOR PERTURBATION THEORY

π+π− Atom in Chiral Perturbation Theory

Hadronic π+π− atom is studied in the relativistic perturbative approach based on the Bethe-Salpeter equation. The general expression for the atom lifetime is derived. Lowest-order corrections to the relativistic Deser-type formula for the atom lifetime are evaluated within the Chiral Perturbation Theory. PACS number(s): 11.10.St, 12.39.Fe, 13.40.Dk, 13.40.Ks, 13.75.Lb Typeset using REVTEX

Electric field thermokinetic spectroscopy

Is proposed the new method of investigating the thermophysical and structural characteristics of materials and models, based on the measurement of electrostatic pour on, appearing with the heating or mechanical loads. Exists a large quantity of diagnostic methods of the study of the properties of materials and models. But from the view of researchers thus far slipped off the very promising meth...

Relativistic Quantum Field Theory

Electric-field-induced relativistic Larmor-frequency reduction

Using the numerical solution to the time-dependent Dirac equation we show that the effect of relativity on the usual Larmor period for an electron in a magnetic field can be enhanced drastically if a suitably scaled and aligned static electric field is added to the interaction. This electric field does not change the electron’s speed but leads to an elliptical spin precession due to relativity....

Resonances and convergence of perturbation theory for N-body atomic systems in external AC-electric field

It is proved that the action of a weak external AC-electric field of frequency 03C9/203C0 shifts all non-threshold bound states and resonances of any N-body atomic system into resonances of the AC-Lo Surdo-Stark effect, defined as eigenvalues of the complex scaled Floquet Hamiltonian. In marked contrast with the cc~ = 0, DC-field case, the Rayleigh-Schrodinger perturbation expansion converges t...