Theoretical analysis of xuv photoabsorption spectra of laser-produced iodine plasmas
Theoretical analysis of xuv photoabsorption spectra of laser-produced iodine plasmas
复制标题
激光产生的碘等离子体的 xuv 光吸收光谱的理论分析
DOI：
10.1103/physreva.78.043401
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发表时间：
2008-10
影响因子：
2.9
通讯作者：
O'Sullivan, G.
中科院分区：
文献类型：
--
作者：
Hayden, P.;Dong, C. Z.;Murphy, N.;White, J.;Su, M. G.;O'Sullivan, G.
The $4d$ photoabsorption spectra of ${\mathrm{I}}^{2+}$, ${\mathrm{I}}^{3+}$, and ${\mathrm{I}}^{4+}$ have been obtained in the $70\char21{}127\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ region with the dual laser-produced plasma technique at time delays ranging from $400\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}520\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$. With decreasing time delay, the dominant contribution to the spectra evolves from the ${\mathrm{I}}^{2+}$ to the ${\mathrm{I}}^{4+}$ ions, and each spectrum contains discrete $4d\text{\ensuremath{-}}nf$ transitions and a broad $4d\text{\ensuremath{-}}\ensuremath{\epsilon}f$ shape resonance, which are identified with the aid of multiconfiguration Hartree-Fock calculations. The excited states decay by direct autoionization involving $5s$ or $5p$ electrons, and rates for the different processes and resulting linewidths were calculated. With increasing ionization, the $4d\text{\ensuremath{-}}\ensuremath{\epsilon}f$ shape resonance become intense and broader in going from ${\mathrm{I}}^{2+}$ to ${\mathrm{I}}^{3+}$, and then vanishes at ${\mathrm{I}}^{5+}$. In addition, the discrete structure of the calculated spectrum of each ion gradually approaches the corresponding shape resonance position. Based on the assumption of a normalized Boltzmann distribution among the excited states and a steady-state collisional-radiative model, we reproduced spectra which are in good agreement with experiment.
The $4d$ photoabsorption spectra of ${\mathrm{I}}^{2+}$, ${\mathrm{I}}^{3+}$, and ${\mathrm{I}}^{4+}$ have been obtained in the $70\char21{}127\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ region with the dual laser-produced plasma technique at time delays ranging from $400\phantom{\rule{0.3em}{0ex}}\text{to}\phantom{\rule{0.3em}{0ex}}520\phantom{\rule{0.3em}{0ex}}\mathrm{ns}$. With decreasing time delay, the dominant contribution to the spectra evolves from the ${\mathrm{I}}^{2+}$ to the ${\mathrm{I}}^{4+}$ ions, and each spectrum contains discrete $4d\text{\ensuremath{-}}nf$ transitions and a broad $4d\text{\ensuremath{-}}\ensuremath{\epsilon}f$ shape resonance, which are identified with the aid of multiconfiguration Hartree-Fock calculations. The excited states decay by direct autoionization involving $5s$ or $5p$ electrons, and rates for the different processes and resulting linewidths were calculated. With increasing ionization, the $4d\text{\ensuremath{-}}\ensuremath{\epsilon}f$ shape resonance become intense and broader in going from ${\mathrm{I}}^{2+}$ to ${\mathrm{I}}^{3+}$, and then vanishes at ${\mathrm{I}}^{5+}$. In addition, the discrete structure of the calculated spectrum of each ion gradually approaches the corresponding shape resonance position. Based on the assumption of a normalized Boltzmann distribution among the excited states and a steady-state collisional-radiative model, we reproduced spectra which are in good agreement with experiment.