A. V. Loboda

Consistent quantum approach to new laser-electron-nuclear effects in diatomic molecules

We present a consistent, quantum approach to the calculation of electron-nuclear γ. spectra (set of vibrational and rotational satellites) for nuclei in diatomic molecules. The approach generelizes the well known Letokhov-Minogin model and is based on the Dunham model potential approximation for potential curves of diatomic molecules. The method is applied to the calculation of probabilities of the vibration-rotation-nuclear transitions in a case of emission and absorption spectrum for the nucleus 127I (Eγ(0) = 203 keV) linked with the molecule H127I.

Gauge-Invariant QED Perturbation Theory Approach to Calculating Nuclear Electric Quadrupole Moments, Hyperfine Structure Constants for Heavy Atoms and Ions

Relativistic calculation of the spectrum hyperfine structure parameters for heavy atoms and multicharged ions with an account of the relativistic, correlation, nuclear, quantum electrodynamics (QED) effects is carried out. Our calculation method is based on the gauge-invariant QED perturbation theory (PT) with using the optimized one-quasiparticle representation firstly in the theory of the hyperfine structure for relativistic systems. The energies and constants of the hyperfine structure, derivatives of the one-electron characteristics on nuclear radius, nuclear electric quadrupole, magnetic dipole moments Q for atom of the hydrogen 1H (test calculation), superheavy H-like ion with nuclear charge Z = 170, Li-like multicharged ions with Z = 20 ÷ 100, neutral atoms of 235U, 201Hg and 227Ra are calculated.

GENERALIZED MULTICONFIGURATION MODEL OF DECAY OF MULTIPOLE GIANT RESONANCES APPLIED TO ANALYSIS OF REACTION (μ - n) ON THE NUCLEUS 40Ca

It is presented the generalized multiconfiguration model to decay of the multipole giant resonances (MGR), which is based on the shell models (with limited basis) and microscopic model of pre-equilibrium decay with statistical account for complex configurations 2p2h, 3p3h etc. The model is applied to analysis of reaction (μ-n) on the nucleus 40Ca.

QED Approach to Modeling Spectra of the Multicharged Ions in a Plasma: Oscillator and Electron‐ion Collision Strengths

The uniform energy approach, formally based on the QED theory with using gauge invariant scheme of generation of the optimal one‐electron representation, is used for the description of spectra of the multicharged ions in a laser plasma, calculation of electron‐ion collision strengths, cross‐sections in Ne‐like and Ar‐like ions.

Relativistic Quantum Chemistry of Heavy Ions and Hadronic Atomic Systems: Spectra and Energy Shifts

The levels energies and energy shifts are calculated for superheavy Li‐like ions and some kaonic atoms on the basis of the gauge‐invariant QED perturbation theory (PT) with an account of nuclear, exchange‐correlation and radiative effects.

QED Approach to Atoms in a Laser Field: Multi-Photon Resonances and Above Threshold Ionization

A new consistent method for studying the interaction of atom with a realistic laser field, based on the quantum electrodynamics (QED) and S-matrix adiabatic formalism Gell-Mann and Low, is presented. In relativistic case the Gell-Mann and Low formula expressed an energy shift δE through QED scattering matrix including the interaction with as the laser field as the photon vacuum field. It is natural to describe the laser field-atom interaction by means of the radiation emission and absorption lines. Their position and shape fully determine the spectroscopy of atom in a field. The radiation atomic lines can be described by moments of different orders μn. The main contribution into μn is given by the resonant range. The values μn can be expanded into perturbation theory (PT) series. As example, the method is used for numerical calculation of the three-photon resonant, four-photon ionization profile of atomic hydrogen (1s-2p transition; wavelength = 365 nm) and multi-photon resonance width and shift for transition 6S-6F in the atom of Cs (wavelength 1,059 nm) in a laser pulses with the Gaussian and soliton-like shapes. The results of calculation the above threshold ionization (ATI) characteristics for atom of magnesium field are presented too.

Relativistic Quantum Chemistry of Heavy Elements: Interatomic potentials and Lines Shift for Systems 'Alkali Elements-Inert Gases'

New relativistic approach, based on the gauge‐invariant perturbation theory (PT) with using the optimized wave functions basis’s, is applied to calculating the inter atomic potentials, hyper fine structure (hfs) collision shift for alkali atoms in atmosphere of inert gases. Data for inter atomic potentials, collision shifts of the Rb and Cs atoms in atmosphere of the inert gas He are presented.

Monte-Carlo Quantum Chemistry of Biogene Amines. Laser and Neutron Capture Effects

Monte‐Carlo quantum calculation of the cluster consisting of the serotonine ST (histamine HM) molecules and 100 molecules of water is carried out. It is found that the zwitterion appears as expected to be strongly favoured with respect to neutral molecule. The perspective possibilities of laser and neutron capture action on different biomolecules are indicated.

QUANTUM MEASURE OF FREQUENCY AND SENSING THE COLLISIONAL SHIFT OF THE YTTERBIUM HYPERFINE LINES IN MEDIUM OF HELIUM GAS

A problems of constructing the ytterbium quantum measure of frequency and sensing the collisional shift of the ytterbium hyperfine structure (HFS) lines in a medium of bath (He) gas are studied. Relativistic approach is used in calculating the inter atomic potentials, oscillator strengths, HFS collision shift and broadening for ytterbium atom in a medium of helium bath gas.

Spectral Broadening of Excitation induced by Ultralong‐range Interaction in a Cold Gas of Rydberg Atoms

Preliminary results of calculating the broadening of spectral lines of excited atoms induced by ultralong‐ range (100 Bohr radii) interactions in a cold gas of Rb atoms within the “own pressure” approximation and perturbation theory formalism are presented.