X-ray emission from heavy atomic collisions : couplings of inner shells in superheavy quasimolecules
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Abstract
Overcritical electromagnetic fields with a coupling strength of ZUA greater than or equal to 1/alpha (=137, with alpha being the fine structure constant) can be experienced in superheavy quasimolecules (atomic number ZUA = Z1+Z2) formed transiently in close collisions of two very heavy atomic partners (Z1, Z2) at velocities (vion) smaller compared to the orbital velocity of the innermost electrons of concern (ve-). The inner shell processes in these collisions are governed approximately by the adiabaticity parameter (= vion/ve-)2. Beyond ZUA = 137 the normal Dirac equation for a point charge cannot be solved and for ZUA > 160 the innermost electron levels even dive into the negative continuum. Moderately slow (vionLink to publications or other datasets
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NIM B 235 (2005) 309; NIM B, 245 (2006) 56; Radiation Physics and Chemistry, 75 (2006) 2014.