Northern (Arctic) Federal University.   M.   B.   University

Center for Theoretical Physics

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About the Center

Director   Center: Professor Viktor Matveev

Location   Center: Russia, 163002, city   Arkhangelsk, etc.   Lomonosov,   4 ( N(A) FU , a.   32)

Phone: (+ 7   8182)   68 – 31-84

E   e-mail: v.matveev@narfu.ru

Posters: horizontal (1.5m & times; 1m; source ), vertical (1m & times; 1.5m; source )

The center

Research interests center staff make up the collision of heavy ions, sputtering of metals in the form of clusters, interaction of atoms with ultra-short pulses of electromagnetic field, elementary processes with the participation of exotic atoms.

The theoretical investigations are carried out in the center closely related to modern experiments and technological developments. Create the appropriate models and methods of calculations, and based on them are carried out specific calculations. Preparations are under way and highly qualified young scientists Teachers of older years.

At the center operates a weekly scientific seminar , the work is done by Research Grants . On a regular basis the scientific practice of students the Faculty of Physics, exercising management graduate, performed and graduate course work.

A separate direction of activity of the center is to develop and support electronic library , including both research and educational publications.

Basic research results

The theory of inelastic collisions between fast (relativistic) heavy (including structural) ions with the atoms, applicable in a wide energy range collision with a standard non-relativistic limit and passing in ultrarelativistic case, the result of an exact solution of the Dirac equation. On its calculated based on the excitation and ionization of a hydrogen atom, and one-off dual excitation and ionization of helium-like atom, a multiple (up to eight) ionization of neon atom and (eighteen) ionization of argon. Obtained simple analytical expression for the inelastic cross sections, set the recurrence the relationship between the different sections of the ionization multiplicity. It noted good The agreement with experiment.

The theory of relativistic energy loss of heavy ions in the structural collisions with atoms. A simple formula for effective inhibition. In the considered range of parameters Born approximation, strictly speaking, does not apply. Under the structural ions refers to ions containing partially filled electronic shells and described as the two longest charges. Such ions usually having a significant charge (for example, partially stripped uranium ions) used in many experiments in modern accelerators of heavy ions.

The theory of ion sputtering of the metal in the form of large neutral and charged clusters. Carried out calculations of the relative yield of clusters depending on the number of atoms in the cluster, by bombarding various metals ( Al , Ag , Nb and Ta ) singly charged ions of argon gold at an energy of 5   keV atom. It has reached a good agreement with experimental data. We develop fluctuation mechanism of the formation of the charge composition large clusters, which allows to describe the dependence charge distributions of the cluster size and temperature of the target.

The theory of electron transitions and the radiation of an atom (relativistic) when interacting with a spatially inhomogeneous ultrashort electromagnetic pulse, obtained excitation probabilities and ionization, and the re-emission spectra and section atom such a pulse. As an example, consider the one-electron and two-electron inelastic processes accompanying the interaction ultrashort pulses with hydrogen and helium-like atoms. The developed technique allows to produce an accurate accounting of how the spatial inhomogeneity of the field of ultrashort pulse and the photon momentum in re-emission processes.

The proposed theory and conducted on the basis of their calculations are original, the results of published in leading domestic and foreign publications.

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traps and reservoirs of exotic atoms and their components

exotic atoms

ultrashort electromagnetic pulse

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