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Lifetime-resolved H$$^{*}$$ fluorescence following O(1s) excitation/ionisation in gas-phase water molecules

Harries, J.; Gejo, Tatsuo*; Sullivan, J. P.*; Azuma, Yoshiro*

In this research we have obtained new information on the photo-dissociation dynamics of the water molecule following O (1s) inner-shell excitation/ionisation. When the O 1s electron is excited neutral excited H atoms can be produced. By investigating which states these H atoms are information can be obtained on the dissociation routes. When the inner-shell O 1s electron is excited/ionises, an unstable H$$_2$$O$$^+$$ ion core is formed. This is unstable, and Auger decay occurs. The resulting H$$_2$$O$$^{2+}$$ ion core dissociates, and one of the fragments can capture the initially excited electron. When this fragment is H$$^+$$, a neutral H atom is formed. In this research we use the pulsed nature of synchrotron radiation to study the lifetimes of the fluorescing excited states produced.

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