Metastable innershell molecular state (MIMS) III: The universal binding energy and bond length of the homonucleus K-shell MIMS

Abstract This paper reports the discovery of a universal Z 2 -dependency of the binding energy of the homonucleus K-shell MIMS (K-MIMS: Metastable Innershell Molecular State bound by K-shell electrons), which has been established by analyzing extensive existing experimental data over several decades. An intuitive analytical theory on the K-MIMS has been developed for the homologous molecules to the He 2 ⁎ excimer, which elucidates the universal Z -dependent behavior of the K-MIMS. The theory predicts a 1 / Z -dependency of the K-MIMS bond length, which is in agreement with the quasimolecule sizes estimated from the x -ray generation cross-sections in H-like Bi 82+ and U 91+ impact on Au solids.