K^h_alpha x-ray energy <em>E_r</em> (Ry), rate <em>A_ji</em> (10¹³ s⁻¹) and autoionization width Γ_<em>a</em> (eV) of the double <em>K</em>-vacancy state 1s⁰2s²2p⁶ ¹S

<b>Table 2.</b> K^h_\alpha x-ray energy <em>E_r</em> (Ry), rate <em>A_ji</em> (10¹³ s⁻¹) and autoionization width Γ_<em>a</em> (eV) of the double <em>K</em>-vacancy state 1s⁰2s²2p⁶ ¹S. Available experimental and theoretical data are given for comparison. <strong>Abstract</strong> A close-coupling calculation is performed for the photoionization cross section of the high-lying core-excited state 1s2s²2p⁵ ¹P^o of Ne^{2 +} in the energy region of the double <em>K</em>-vacancy resonance 1s⁰2s²2p⁶ ¹S. The calculation is carried out by using the <em>R</em>-matrix method in the <em>LS</em>-coupling scheme, which includes 27 target states and extensive configuration interaction. The <em>KK</em>-<em>KL</em> x-ray energy, rate and autoionization width of the double <em>K</em>-vacancy state, together with <em>KK</em>-<em>KLL</em> Auger energies and branching ratios of the main channels, are obtained from the cross sections and the contributions of these channels. The calculated resonance energy and x-ray rate are in good agreement with the existing experimental and theoretical results. For the Auger width, our result agrees well with the available experimental result and it is very close to the average of other theoretical data, which shows considerable differences with each other. The Auger energy of the predominate channel <em>KK</em>-<em>KL</em>₂₃<em>L</em>₂₃ ²D is in rather good agreement with recent experiments on the Auger spectra. Our branching ratios for the channels <em>KK</em>-<em>KL</em>₂₃<em>L</em>₂₃ ²D and <em>KK</em>-<em>KL</em>₂₃<em>L</em>₂₃ ²S are larger than the results obtained by the multi-configuration Dirac–Fock method by ~20% on average, which may be due to the coupling of the continuum channels.表2. 双K空位态（double K-vacancy state）1s⁰2s²2p⁶ ¹S的K^h_α X射线能量E_r（里德伯单位Ry）、跃迁速率A_ji（10¹³ s⁻¹）与自电离宽度Γ_a（电子伏特eV）。文中同时给出了可用于对比的已有实验与理论数据。 **摘要** 针对Ne²+的高能量芯激发态（high-lying core-excited state）1s2s²2p⁵ ¹P^o在双K空位共振态1s⁰2s²2p⁶ ¹S对应的能量区间内的光电离截面（photoionization cross section）开展了密耦合计算。本次计算采用LS耦合方案下的R矩阵法（R-matrix method），包含27个靶态并考虑了大范围的组态相互作用（configuration interaction）。从各通道的截面及其贡献中，可得到双K空位态的KK-KL X射线能量、跃迁速率与自电离宽度，以及KK-KLL俄歇能与主要通道的分支比（branching ratios）。计算得到的共振能量与X射线跃迁速率与已有实验及理论结果吻合良好。对于俄歇宽度，本研究结果与可获取的实验结果吻合较好，且与其他理论数据的平均值非常接近——而这些理论数据之间存在显著差异。主导通道KK-KL₂₃L₂₃ ²D的俄歇能与近期针对俄歇能谱（Auger spectra）的实验结果吻合较好。本研究针对通道KK-KL₂₃L₂₃ ²D与KK-KL₂₃L₂₃ ²S的分支比，平均比多组态狄拉克-福克方法（multi-configuration Dirac–Fock method）得到的结果高出约20%，这一差异可能源于连续通道（continuum channels）的耦合作用。