The absorption cross section and the ionization quantum yield of H 2 O have been measured using a synchrotron radiation source between 9 and 22 eV. Comparison between the two curves highlights competition between relaxation processes for Rydberg states converging to the first à 2 A 1 and to the second 2 B 2 excited states of H 2 O + . Comparison with D 2 O absorption and ionization yields, derived from Katayama et al (1973 J. Chem. Phys. 59 4309), reveals specific energy-dependent deuteration effects on competitive predissociation and autoionization relaxation channels. Direct ionization was found to be only slightly affected by deuteration.
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Dulieu et al. (2003) studied this question.
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