23 Result(s)

Article

Quasi-Molecular Optical Transitions near Resonance Lines of Kr and Xe Atoms in Helium

The emission and absorption spectra of Kr and Xe atoms near the ^1,3P₁–¹S₀ resonance lines in an atmosphere of helium atoms under equilibrium conditions have been theoretically investigated. Potential curves for e...

A. Z. Devdariani, A. L. Zagrebin, M. G. Lednev in Optics and Spectroscopy (2020)

Article

Resonant Charge Exchange in an Electrostatic Field

The effect of an electrostatic field existing, for example, in plasma on the resonant charge exchange at collision velocities significantly lower than the charge exchange electron velocity is estimated using t...

A. Z. Devdariani, A. O. Artamonova, A. K. Belyaev in Technical Physics Letters (2020)

Article

Influence of the Density of Buffer Gas Atoms on the Shape of the HgXe(A³0⁺) → HgXe(X¹0⁺) Excimer Band

The reasons for the discrepancies between the experimental data on the shape of long-wavelength continua near the 6³P₁ → 6¹S₀ resonance line of a mercury atom in a xenon atmosphere obtained by different authors a...

A. Z. Devdariani, A. L. Zagrebin, N. A. Kryukov, M. G. Lednev… in Optics and Spectroscopy (2019)

Article

Radiative transitions in quasi-molecules

Radiative transitions occurring at atomic collisions are considered. Attention is focused on the transitions that are either impossible in individual atoms or ions or forbidden by the selection rules. The exci...

A. Z. Devdariani in Optics and Spectroscopy (2015)

Article

Radiative transitions under H + H^– collisions

The H + H^–→ H + H^–+ ħω reaction gives an example of bound-bound transitions in the H + H^– quasimolecules temporally formed during collisions from non-excited particles. The present work is aimed at the calculatio...

A. Z. Devdariani, A. V. Dadonova in Russian Journal of Physical Chemistry B (2015)

Article

Radiative lifetimes of the ν'(1³ P ₂) states of the CdAr, CdKr, HgAr, HgKr, HgXe quasimolecules

In the present review the results of the theoretical investigatation of the radiative lifetimes of the metastable ν'(1³ P ₂) states of CdAr, CdKr, H...

O. S. Alekseeva, A. Z. Devdariani, M. G. Lednev… in Russian Journal of Physical Chemistry B (2015)

Article

The destruction of negative ions in slow collisions with atoms: Taking into account the quantum-mechanical character of nuclear motions

The collisional destruction of negative ions close to the reaction threshold is considered using the delta-function model. The dynamics of an electron and atoms is explicitly included in the Schrödinger equati...

A. Z. Devdariani, Yu. N. Demkov in Russian Journal of Physical Chemistry B (2012)

Article

Lifetime of weakly bound He(2¹ S)-Ne molecules. Temperature dependence

Based on recently improved quantum-chemical data, the lifetimes of the vibrational states of the He(2¹ S)-Ne weakly bound molecule are calculated. The resulting estimates take into account both bo...

A. Z. Devdariani, A. K. Belyaev, A. B. Alekseev… in Russian Journal of Physical Chemistry B (2011)

Article

Radiative lifetime of the v′1(³ P ₂) states of the HgAr, HgKr, and HgXe molecules and the probabilities A(v′, v″) of the v′1(³ P ₂−v″0+(¹ S ₀) transitions

A semiempirical method of analysis of quasi-molecular terms in conjunction with experimental potentials of interaction of Hg(6(³ P ₁)) atoms with Ar, Kr, and Xe atoms are used to o...

O. S. Alekseeva, A. Z. Devdariani… in Russian Journal of Physical Chemistry B (2011)

Article

Associative ionization in slow collisions of atoms

An analysis of the modern theory of associative ionization (AI) is performed, and ways of its further development are discussed. The threshold behavior of the cross section of endothermic AI reactions is consi...

G. V. Golubkov, A. Z. Devdariani in Russian Journal of Physical Chemistry B (2011)

Article

Emission of highly excited atoms and molecules in the upper atmosphere

The emission ability of Rydberg atoms and molecules in the orbitally degenerate states is considered. The mechanisms of their formation in the F, E, and D upper atmosphere layers are analyzed. The characterist...

G. V. Golubkov, M. G. Golubkov, I. V. Karpov… in Russian Journal of Physical Chemistry B (2011)

Article

Multiphoton mass spectra of Xe₂ molecules in the range of excited Xe*(6p, 5d) atoms

The (2 + 1) photoionization mass spectra of Xe₂ molecules are studied in a supersonic jet upon excitation by laser radiation in the energy range 80321.3–77821 cm⁻¹, corresponding to the dissociation of the Xe₂ mo...

M. A. Khodorkovskiĭ, A. A. Belyaeva, L. P. Rakcheeva… in Optics and Spectroscopy (2006)

Article

Radiative quenching and excitation of metastable states upon differential scattering of atoms: II. The He(1¹ S–2¹ S)-Ne molecule

The differential cross sections of radiative-collisional quenching (absorption) of a metastable state of a colliding atom are calculated for the first time. As a particular example, the reaction of quenching (...

A. Z. Devdariani, E. A. Chesnokov in Optics and Spectroscopy (2005)

Article

Radiative quenching and excitation of metastable states upon differential scattering of atoms: I. Uniform quasi-classical theory

A theory of radiative-collisional transitions between the ground and metastable ¹ S states of a colliding atom is proposed. The theory uses the uniform quasi-classical approximation generalized to the case of sph...

A. Z. Devdariani, E. A. Chesnokov in Optics and Spectroscopy (2005)

Article

Collision of Rydberg atom A^** with atom B in the ground electronic state. Optical potential

A method for calculating the complex optical potential of slowly colliding Rydberg atom A^** and neutral atom B in the ground electronic state is suggested. The method is based on the asymptotic approach and the t...

G. V. Golubkov, A. Z. Devdariani… in Journal of Experimental and Theoretical Ph… (2002)

Article

A uniform quasi-classical description of radiative transitions for asymmetric rare-gas atom-atom collisions

The uniform quasi-classical approximation [14] is used to describe the optical spectra formed during asymmetric collisions between atoms of rare gases in which one of the atoms is in a metastable state. We con...

A. Z. Devdariani, A. L. Zagrebin… in Journal of Experimental and Theoretical Ph… (2002)

Article

Collision of Rydberg atom A** with ground-state atom B: Optical potential

The method of optical potential was used to calculate the slow collision of Rydberg atom A** with ground-state atom B. As an example, calculations were carried out for the Na**(nl)+He system.

G. V. Golubkov, A. Z. Devdariani… in Journal of Experimental and Theoretical Ph… (2002)

Article

Interaction potentials of Hg* + He at moderate interatomic separations and the radiative decay of the Hg(6³ P ²) metastable state in collisions with He atoms

By using the modified method of the Fermi pseudopotential and the effective Hamiltonian method, a multiconfiguration calculation of the potential curves is performed for the Hg(6^{1, 3} P ...

A. Z. Devdariani, A. L. Zagrebin, M. G. Lednev, A. B. Alekseyev… in Optics and Spectroscopy (2001)

Article

Quasi-molecular emission and nonadiabatic transitions: II. Ca(4s4p ¹ P, 4s3d ¹ D)-He(1s ², ¹ S ₀) quasi-molecule

Calculations are made of the quasi-molecular emission spectra formed in thermal collisions of Ca(4s4p, ¹ P, 4s3d, ¹ D) and He(1s ², ¹ S ...

E. N. Bichutskaya, A. Z. Devdariani, A. L. Zagrebin in Optics and Spectroscopy (2000)

Article

Temperature dependence of the edge of the spectral line in classical atomic motion

A. Z. Devdariani, Yu. N. Sebyakin in Journal of Applied Spectroscopy (1985)