Abstract
This chapter discusses the lifetimes of molecular negative ion resonances on surfaces. The lifetime of the resonance of molecular O 2 physisorbed on graphite is qualitatively probed via the ratio of overtone to fundamental vibrational intensities in the resonant energy loss spectroscopy (EELS) spectrum as a function of surface coverage. Resonant vibrational excitation occurs because of nuclear motion in the potential of the temporary negative ion formed by electron capture. The impact energy is set near the observed peak in the cross-section for vibrational excitation, close to the peak assigned by gas phase workers to the ion state. The frequencies of the observed modes correspond to the fundamental and overtone excitations of gas phase O 2 . Future work is planned to focus on the coverage dependence of the resonance lifetime and also of shifts in the resonance energy.
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