K-Shell excited Li-like ions: Electron spectroscopy of the doublet term system

Abstract

Electron energies of autoionising doubly excited ls2h'I (n' = 2, 3) L-states of Li-like ions are reported for C IV, N V, and 0 VI.The autoionising states are produced in electron capture reactions from two-electron targets (He. Hz) by slow (E,,,, g 5 keV/amu) charge selected ion beams. fn this way, differentiation of doublet and quartet terms is possible and the charge state of the emitting ion is unambiguously defined. Comparison is made with available data From other experiments and with relativistic atomic structure calculations.A multiconfiguration variational approach as well as a Z-expansion calculation are found to give better agreemen& with experimental data than a multico~lfigu~ational Dirac-Fock method.

Расчёт энергий и оже-ширин состояний 1s2l2l' иона O-=SUP=-5+-=/SUP=- с помощью релятивистского метода наложения конфигураций с комплексным вращением

“…Ниже проводится сравнение результатов, полученных в рамках настоящего исследования, с другими доступными значениями. Стоит отметить, что на сегодняшний день в литературе представлено довольно много теоретических [20,[28][29][30][52][53][54][55] и экспериментальных [11,[56][57][58][59][60][61][62] результатов для энергий рассматриваемых автоионизационных состояний. Особый интерес представляет сравнение с наиболее точными результатами теоретических расчётов [16], где авторами был использован метод балансировки базисного набора.…”

Radiative and autoionization rates of the metastable 24 P 0 J states in lithiumlike neon

“…The degree of accuracy in the calculation of the ASF, i.e. in the treatment of the electron-electron correlations by the above multiconfiguration calculations needs further investigation [1,9], as fully relativistic CI calculations are not routinely available. Another motivation for fluorescence yield measurements is their independence from cascades, in contrast to total lifetime measurements which can be strongly influenced.…”

Investigation of electron capture in swift C4+ (1s2s 3S) collisions with gas targets using a zero-degree Auger projectile spectroscopy apparatus built with the L45 beam line at the ‘Demokritos’ 5.5MV tandem accelerator

“…In CTMC the system under investigation is represented by a macroscopic classical model: The three-body motion Newton's equations for the electron and the protons are solved by numerical integration and examined statistically. Another theory for electron capture is the Classical Overbarrier Model [66][67][68][69], again valid mostly for intermediate velocities: The capture of the electron is achieved when the potential energy barrier between projectile and target equals the Stark-shifted ionization energy [70]. Although somehow simplified, it can predict n distributions (i.e.…”

“…This is very similar to the selective cascade feeding of the 1s2s2p 4 P state also independently identified by Zouros et al [5] (2008) as an important mechanism complicating the analysis of spin statistics as expressed in the ratio R of 1s2s2p quartets to doublets in He-like fluorine. Finally, Niehaus [111] and Mack [67][68][69] should be taken into consideration and their CMA Spectroscopy studies regarding the C 4+ + gas collision system and slow collisions. In these studies, the Classical Over-barrier Model [66] for theoretical calculations is applied.…”

“…These electromagnetic transitions in atoms or molecules are treated in the Electric Dipole approximation [271]. The Selection Rules that arise in this approximation are presented in [68,155,191,235,[272][273][274][275][276].…”