Intensity enhancement in the emission spectra of Sb, Sn, and W ions due to the mixing of configurations with symmetric exchange of symmetry

Abstract

The essential narrowing of emission spectrum due to the configuration mixing with a symmetric exchange of symmetry is considered for ions with an open 4d N electron shell. The relativistic CI calculations have been performed for Sn 9+ -Sn 12+and Sb 10+ -Sb 11+ ions, which are the most promising emitters for EUV lithography, and for W q+ ions, which give a strong undesirable emission in tokamak plasma. It is shown that the inclusion of interaction with other energetically neighbouring configurations only weakly influences the integral characteristics of the main group of lines or quasicontinuum band -its total intensity, width, and shape. The similarity between photoexcitation and emission spectra, related with the ground level, that has been previously established for highly charged tungsten ions, manifests itself also at medium ionization degrees. The relative widths of intense groups of lines in such spectra of tin and antimony ions increase in comparison with tungsten; however, the spectra of Sn 9+ and Sb 10+ with a half-filled 4d 5 shell have an extremely narrow width.

Interaction of 4p54dN+1and 4p64dN−14f configurations and its influence on the photoexcitation and emission spectra in the isoelectronic and isonuclear sequences

“…It is demonstrated by the comparison of the photoexcitation spectrum for Sn 12+ , obtained in the two-configuration and empirical many-configuration approximations (figure 1), as well as of the emission spectra for W 31+ (figure 2) and W 30+ [22], calculated in the two-and many-configuration relativistic approximations. The interaction with additional configurations does not change essentially the distribution of intensity in the spectra; the formation of a narrow main group of lines is mainly determined by SEOS correlations.…”

Theoretical investigation of spectroscopic properties of W26+in EBIT plasma

“…The T K K ( , ) 1 2 value, divided by the statistical weight = g g K ( ) 1 1 of the analyzed configuration K 1 has the meaning of the average weight of the admixed configuration K 2 in the expansion of the wave function for K 1 . CIS has been successfully applied for the investigation of energy levels [26], Auger cascades [27][28][29], electric dipole [30] and magnetic dipole [31,32] transitions.…”