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Neutral photodissociation from N₂ has been studied in the range 20--30 eV by observing dispersed fluorescence from excited N fragments. From comparisons with calculations using many-body perturbation theory it follows that these fragmentations follow from predissociations of N₂ Rydberg series by a number of non-Rydberg doubly excited states.
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Erman et al. (1999) studied this question.
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