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Abstract
Two basic mechanisms of X-ray production in recombination of heavy bare ions with free electrons in an electron cooler of a storage ring are discussed theoretically. In the first process, the radiative recombination of bare ions with electrons, the recombination rates for individual nl-states and the energy spectra of X-rays are described within the nonrelativistic dipole approximation in the low-energy limit. Next, the emission of characteristic X-rays due to the radiative deexcitation cascades in H-like ions are studied in terms of total branching ratios averaged over the initial population of l-states formed in radiative recombination. Strong enhancement of the population of selected low nl-states is found. A possibility to develop precise X-ray spectroscopy by using a 0°-Doppler-tuned spectrometer in a storage ring is also discussed.
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