The Photodissociation dynamics of HO after recapture process via Auger decay of O 1s inner-shell excitation

Gejo, Tatsuo*; Oura, Masaki*; Kuniwake, Miki*; Homma, Kenji*; Harries, J.

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 as well as neutral excited H atoms, highly-excited O and OH fragments can also be produced. By investigating which states these fragments are in information can be obtained on the dissociation routes. When the inner-shell O 1s electron is excited/ionised, an HO ion core is formed. This is unstable, and Auger decay occurs. The resulting HO ion core dissociates, and one of the fragments can capture the initially excited electron. When this fragment is O, a neutral O atom is formed. This fragment can undergo further Auger decay, resulting in the production of an electron with low kinetic energy. In this research these electrons are detected and energy analysed.