Networks of non-linear oscillators have a potential to simulate physiological functions of living system. Expected
similarity in spatiotemporal behavior was obtained in between the inter-cellular concentration pulse in Ca2+ triggered by
f-sec laser irradiation and the current pulse propagation along excitable non-linear electrode pairs triggered by electric
stimulus. These resemblances are owing to the same dynamical rules governing both biological and electrochemical
systems.
The processes of desorption and dissociation for O2 on Pd(111) under femtosecond laser irradiation have been investigated. Desorption is characterize by a high yield, a nonlinear fluence dependence, and a dominant subpicosecond feature in two-pulse correlation measurements. These observations are consistent with a process driven by the high substrate electronic temperature produced by the femtosecond laser pulse. The correlation measurements also reveal the existence of a weaker feature persisting >10 ps which is attributed to an enhancement of the desorption rate by adsorbate vibrational excitation. Under the same conditions where efficient desorption is occurring, an upper limit of 5% is found for the dissociation of molecular oxygen. This is in contrast to the high branching ratio for dissociation found in thermal activation and conventional photoactivation for the same system. Explanations for the anomalous branching ratio in the femtosecond surface chemistry for O2/Pd(111) within a model involving multiple cycles of electronic excitation are examined.
Conference Committee Involvement (1)
Optomechatronic Micro/Nano Devices and Components II
4 October 2006 | Boston, Massachusetts, United States
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