Evidence for ultra-fast dissociation of molecular water from resonant Auger spectroscopy
2001; Elsevier BV; Volume: 334; Issue: 1-3 Linguagem: Inglês
10.1016/s0009-2614(00)01434-2
ISSN1873-4448
AutoresI. Hjelte, M. N. Piancaśtelli, Reinhold F. Fink, Olle Björneholm, M. Bäßler, R. Feifel, A. Giertz, Helen Wang, Karoline Wiesner, A. Ausmees, Catalin Miron, S. L. Sörensen, S. Svensson,
Tópico(s)Atmospheric Ozone and Climate
ResumoWe present direct evidence for ultra-fast dissociation of molecular water in connection photo-excitation of the O1s→4a1 resonance. The core-excited H2O molecules are shown to dissociate into core-excited O*H and neutral H on a time scale comparable to the core hole lifetime, i.e. a few femtoseconds. This conclusion is based on a resonant Auger study, qualitative arguments and ab initio calculations. `Hot bands' connected to Auger transitions from vibrationally excited OH fragments are identified, and these exhibit a dynamical behavior which qualitatively follows the change in excess energy.
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