The wide spectral range characteristics and dynamic evolution of laser-produced tin plasmas
•The study systematically investigated the wavelength distribution of transitions with principal quantum numbers (Δn=0,1,2) for Sn4+–Sn13+ ions in the wide spectral range of 6–45 nm and their contributions to the spectral profile.•Segmented simulations were conducted based on the assumptions of a no...
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Veröffentlicht in: | Journal of quantitative spectroscopy & radiative transfer 2024-11, Vol.326, p.109120, Article 109120 |
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Sprache: | eng |
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Zusammenfassung: | •The study systematically investigated the wavelength distribution of transitions with principal quantum numbers (Δn=0,1,2) for Sn4+–Sn13+ ions in the wide spectral range of 6–45 nm and their contributions to the spectral profile.•Segmented simulations were conducted based on the assumptions of a normalized Boltzmann distribution among the excited states and a steady-state collisional-radiative model to explain the characteristics of the radiation spectra and variations in state parameters during laser-produced plasma expansion from the core to the outer periphery.•The short wavelength EUV spectra are simulated, and the difference of diagnostic state parameters reflects the non-uniformity of the plasma.
The energy levels and transitions of highly charged Sn ions are key data for analyzing emission spectra, radiative opacity, and conversion efficiency of laser-produced Sn plasmas. Temporally–resolved spectra in the 6–45-nm range were acquired via high-precision, spatio–temporally resolved techniques. In addition, the Cowan code, based on Hartree–Fock multi-configurational interactions, was used to perform structural calculations for Sn4+–Sn13+ ion spectra. Emission spectra in the 11–18-nm range were primarily attributed to Sn8+–Sn12+ ions, with transitions involving principal quantum numbers Δn=0 and Δn=1. Whereas, emission spectra in the 6–11-nm and 18–45-nm ranges were mainly attributed to Sn9+–Sn13+and Sn4+– Sn9+ions, with transitions involving principal quantum numbers Δn=1,2. Furthermore, Segmented simulations were conducted based on the assumptions of a normalized Boltzmann distribution among the excited states and a steady-state collisional-radiative model to explain the characteristics of the radiation spectra and variations in state parameters variations during laser-produced plasma expansion from the core to the outer periphery. A specific analysis was conducted on the temporal evolution of the electron temperature and density, while the charge state of the plasma was analyzed over the 6–18-nm range. Based on the spectral diagnostics, this work focused on the impact of non-uniformity in the expansion of the Sn plasma. |
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ISSN: | 0022-4073 1879-1352 |
DOI: | 10.1016/j.jqsrt.2024.109120 |