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Absolute cross sections have been measured for the photoionisation of K + ions by VUV radiation in the energy range 31-42.5 eV. The cross section had a maximum value of 3.4*10 -17 cm 2 (+or-20%) at 32 eV and decreased with increasing energy. No autoionisation resonances were found but there were indications of possible structure at about 35.5 and 39.8 eV.
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Peart et al. (1987) studied this question.
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