Advanced Quantum Approach in Radiative and Collisional Spectroscopy of Multicharged Ions in Plasmas

Theoretical Auger Spectroscopy of Solids: Calculation of Energy Parameters

“…The whole calculation of the energies and decay probabilities of a non-degenerate excited state is reduced to the calculation and diagonalization of the complex secular matrix. In the relativistic energy approach [4][5][6][7][8][9], which has received a great applications during solving numerous problems of atomic, molecular and nuclear physics (e.g., see Refs. [1,4,5,[23][24][25][26][27][28][29][30]), the imaginary part of electron energy shift of an atom is directly connected with the radiation decay possibility (transition probability).…”

“…The Auger electron spectroscopy is an effective method to study the chemical composition of solid surfaces and near-surface layers etc [1][2][3][4][5][6][7][8]. Sensing the Auger spectra in atomic systems and solids gives the important data for the whole number of scientific and technological applications.…”

“…The theoretical predictions based on MCDF calculations have been carried out within different approximations and remained hitherto non-satisfactory in many relations. Earlier [11,12] it has been proposed relativistic perturbation theory (PT) method of the Auger decay characteristics for complex atoms, which is based on the Gell-Mann and Low S-matrix formalism energy approach and many-body perturbation theory (PT) formalism [4][5][6][7]. The novel element was in using the optimal basis of the electron state functions derived from the minimization condition for the calibration-non-invariant contribution (the second order PT polarization diagrams contribution) to the imaginary part of the multi-electron system energy already at the first non-disappearing approximation of the PT.…”

Cascade of Auger Transitions in Spectrum of Xenon: Theoretical Data

“…Let us remind following to ref . [2] that studies in modern atomic physics (spectroscopy, spectral lines theory, theory of atomic collisions etc), astrophysics, plasma physics, laser physics and quantum and photoelectronics requires an availability of sets of correct data on the energetic, spectroscopic and structural properties of atoms, including the data on the Auger transitions [1][2][3][4][5][6][7][8]. The kinetic energy of the ejected Auger electron is measured by Auger-electron spectroscopy (AES).…”

“…In fact, a consistent Auger decay theory has to take into account correctly a number of correlation effects, including the energy dependence of the vacancy mass operator, the continuum pressure, spreading of the initial state over a set of configurations etc [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. The most widespread theoretical studying the Auger spectra parameters is based on using the multi-configuration Dirac-Fock (MCDF) calculation [2,3].…”