Metastable innershell molecular state (MIMS) is a class of ultra-high-energy short-lived molecules have the binding energy up to 1,000 times as large and the bond length down to 1/100th of what can be found in typical molecules.
Specifically, the extensive analyses of the data that relate to hard X-ray generating collisions have resulted in a universal law (Z2–dependency) of the binding energy of the homonucleus MIMS bound by K-shell electrons (K-MIMS). Here Z is the atomic number of the constituent atoms of the K-MIMS. Bae further developed a unified theory to elucidate the Z2-dependent behavior of the homonucleus K-MIMS, which behaves much like the helium excimer molecule: He2*. The MIMS theory also predicted a 1/Z dependency law for the bond length of the homonucleus K-MIMS. Based on the MIMS theory, the uranium K-MIMS, for example, is predicted to have 1/100th the bond length, 2,000 times the binding energy, and 5,000 times the characteristic X-ray energy compared to the He excimer molecule. The predicted bond lengths of the bismuth and uranium K-MIMS are in excellent agreement with that estimated from the experimental results by researchers at the GSI Helmholtz Centre for Heavy Ion Research in Darmstadt, GermanyGermany
The inner-shell-bound metastable quasimolecules were proposed to exist in the X-ray generating scattering process since the work by MottMott in the 1930s. The existence of high energy quasimolecules in highly compressed matter (or strongly coupled plasma) was theoretically predicted in the ab initio quantum calculation by Younger et al. in the late 1980s. In 2008, from the result obtained by Mueller, Rafelski and Greiner for quasimolecules in atomic collisions at high impact velocity, Winterberg predicted the existence of inner-shell-bound metastable keV molecules under high pressure and their use for the ignition of thermonuclear reactions. Metastable Innershell Molecular State (MIMS) that is homologous to the rare-gas excimers was proposed by Bae in 2008 to interpret the mysterious anomalous X-ray signals observed by Bae and his colleagues at Brookhaven National Lab (BNL) in the 1990s. For more details, refer to the last section of this article, "Other models for inner-shell-bound molecules."
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