Photoionization of the Li atom: Convergent-close-coupling calculations with a focus on two-electron removal

In a combined experimental and theoretical study, Müller [] revealed highly detailed resonant structure in ionization with excitation and in double ionization of the Li-like <a:math xmlns:a="http://www.w3.org/1998/Math/MathML"> <a:msup> <a:mrow> <a:mi mathvariant="normal">B</a:mi> </a:mrow> <a:mrow> <a:mn>2</a:mn> <a:mo>+</a:mo> </a:mrow> </a:msup> </a:math> ion. That work demonstrated the strong predictive power of the convergent-close-coupling (CCC) method when enhanced by modern supercomputing technology. In the present work, we apply CCC to analogous ionization processes in the Li atom. Again, we find <c:math xmlns:c="http://www.w3.org/1998/Math/MathML"> <c:mi>K</c:mi> </c:math> -shell ionization accompanied by <d:math xmlns:d="http://www.w3.org/1998/Math/MathML"> <d:mi>K</d:mi> </d:math> -shell excitation to contribute relatively strongly to the double photoionization of three-electron Li. Comprehensive detailed comparisons with the existing experimental data are presented and discussed.