Photoion spectrometry has been applied to determine the relative photoionization yields of Ba + ions around the 4d ionization threshold. A ground state Ba + ion beam was merged with monochromatized synchrotron radiation over a length of 15 cm. Counting the number of doubly and triply charged ions produced in the interaction region, we have obtained partial photoion yields as a function of photon energy. Prominent peaks due to resonance Auger processes have been observed below the threshold. A giant resonance structure above 4d threshold was seen only for the Ba 3+ spectrum.
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Koizumi et al. (1995) studied this question.
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