The emission probabilities for quasimolecular K-x-radiation (K-MOR) have been measured in 2~176 collisions at 4.3 MeV/u and 4.8 MeV/u as a function of the scattering angle using the particle-photon-coincidence technique. The probabilities exhibit a superposition of two exponential slopes with different fall-off constants. We identify the sharp fall off at very small impact parameters (<60fm) with the K-MOR contribution from the decay of l sa-vacancies. The flatter slope for impact parameters larger than 60 fin is attributed to the radiative decay of holes in 2pl/2a molecular states.In this way, experimental "lsa-MOR-emission probabilities" could be extracted and compared with theory. For 4.3MeV/u the ls~-and 2pl/2a-excitation probabilities could also be determined and have been compared to coupled-channel calculations and to a scaling law for lsaexcitation.
The quasimolecular 2p'1T -Tso transition energy as a function of the internuclear distance is obtained from the interference structure observed in quasimolecular K X-ray spectra from low energy H-like projectiles measured at certain impact parameters.
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