The Researches About The EUV Spectra Of W-W³⁺and Al³⁺-Al⁴⁺ions

At the aspects of experiment or theory, the spectra of atoms or ions wereresearched, which will help to increase the understanding of the atomic structure anddynamics characteristic of the elements, and also have a great significance fordiagnosis and research of the related fusion plasma and astrophysical plasma. Laserproduced plasma （LPP） and dual laser plasma（DLP）technologies are importantexperimental methods used to produce the EUV spectra of the high ionized stages.With the help of the two kinds of technologies, the corresponding analysis can bemade for time and space resolution, and then to be used for the research on theextreme ultraviolet （EUV） spectra from different ionic states of some elements.By the experimental researches, it is known that, due to some special propertiesof tungsten, such as low sputtering yield, high melting point and low tritium retention,it is a very attractive element to be used as a plasma-facing and divertor material intokamak devices. And the researches of atomic and ionic tungsten atoms are veryimportant for understanding its behavior in a fusion reactor. Therefore, on the basis ofexperimental measurements （J T Costello et al1991, A Müller et al2011）, with usingquasi-relativistic Hartree-Fock method with configuration interaction codes, the4fand5p inner-shell excitations of W-W³⁺ions and the shape of the theoretical spectrawere theoretically analyzed in this work. In addition, the spectra of high ionizedaluminum have been observed in some chemically peculiar stars. And then the studyof EUV emission spectra of high ionized aluminum also has the vital significance forfurther identifying the spectra structure of Al ions in stars to better understand thestars. Thus, on the basis of the analysis of the EUV emission spectra of laser producedaluminum plasma, also with using quasi-relativistic Hartree-Fock method with config-uration interaction codes, the2p EUV emission spectra of Al³⁺-Al⁴⁺ions have beendetailed analyzed.In the process of the research, we also have some new discovery, now the maincontent and the results of the work are summarized as follows:（1） The calculation cross sections of the4f-5d,6d and5p-5d,6d resonances ofthe W-W³⁺ions were shown systematically. We found that the resonance cross section of the5p-5d transition undoubtedly occupy a leading position for each of theexperimental spectra. For the strongest resonant structure, with increasing ionization,the5p-5d resonance region toward the high energy region has a slight movement, andhas weakened gradually. In addition, at the lower energy region the contributions ofthe4f-5d,6d resonances and the contributions of the5p-6d resonances at higherenergies are not negligible.（2） The two wide asymmetric resonant structure of the5p-5d transition wereanalyzed accordingly. According to the analysis, each of the two groups of dominantresonances can be a result of the joint contributions of the5p3/2–5d and5p1/2–5dtransitions.（3） Al IV-V ions are mainly distributed in this wavelength range8-20nmemission spectrum of the aluminum plasma. In addition, in both the experimentalspectra and theoretical calculations, Al V ion spectral structure is more complex thanAl IV ion. For Al V ion, both its ground state and excited states have more complexcoupling structure.