类氯Ar $^{+}$离子的价层光电离
Valence-shell photoionization of chlorine-like Ar$^{+}$ ions
摘要：
报道了光子能量范围为27.4 eV至60.0 eV的Ar $^{+}$离子价壳层光电离的绝对横截面测量结果。通过合并离子束和同步辐射在10毫电子伏的光子能量分辨率的数据，表明初级离子束是一个统计加权的混合物的$^2P^o_{3/2}$基态和$^2P^o_{1/2}$亚稳态的Ar $^{+}$。这种C $\ell$ -类离子的光电离的特点是多个里德伯系列的自电离共振叠加在一个直接的光电离连续。观察到的共振线型表明间接和直接光电离通道之间的干扰。共振特征光谱分配和它们的能量和量子缺陷列表。通过基于中间耦合半相对论Breit-Pauli近似的理论计算，满意地再现了测量结果。
英文摘要：
Absolute cross-section measurements for valence-shell photoionization of Ar$^{+}$ ions are reported for photon energies ranging from 27.4 eV to 60.0 eV. The data, taken by merging beams of ions and synchrotron radiation at a photon energy resolution of 10 meV, indicate that the primary ion beam was a statistically weighted mixture of the $^2P^o_{3/2}$ ground state and the $^2P^o_{1/2}$ metastable state of Ar$^{+}$. Photoionization of this C$\ell$-like ion is characterized by multiple Rydberg series of autoionizing resonances superimposed on a direct photoionization continuum. Observed resonance lineshapes indicate interference between indirect and direct photoionization channels. Resonance features are spectroscopically assigned and their energies and quantum defects are tabulated. The measurements are satisfactorily reproduced by theoretical calculations based on an intermediate coupling semi-relativistic Breit-Pauli approximation.
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