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Resolving the Blueshift in Calculations of the EUV Spectrum of Multiply Charged Tin Ions

arXiv Physics Thursday 04 June 2026, 04:00 UTC By M. L. Reitsma, J. Sheil, O. O. Versolato, E. V. Kahl, J. C. Berengut 1 min read
Key Points

arXiv:2606.04868v1 Announce Type: new Abstract: We report ab initio relativistic calculations on the complex open shell Sn$^{12+}$ highly charged ion, a prototypical plasma ion relevant for extreme ultraviolet (EUV) nanolithography. Previous calculations of EUV emissivity in tin plasmas consistently generate a spectrum in which the region of peak emissivity is blueshifted relative to experiment. By optimising our numerical methods to take full advantage of modern, high-performance CPU...

arXiv:2606.04868v1 Announce Type: new Abstract: We report ab initio relativistic calculations on the complex open shell Sn$^{12+}$ highly charged ion, a prototypical plasma ion relevant for extreme ultraviolet (EUV) nanolithography. Previous calculations of EUV emissivity in tin plasmas consistently generate a spectrum in which the region of peak emissivity is blueshifted relative to experiment. By optimising our numerical methods to take full advantage of modern, high-performance CPU architectures, we are able to completely saturate the configuration interaction within the $n=4$ shell. Coupled with a thorough treatment of core-valence correlation we resolve the blueshift, finding a surprisingly large influence of highly excited states on the spectrum that is dominated by multiply excited states.
CPU (ORG)
Originally published by arXiv Physics Read original →

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