New Directions Atom. Phys., 153 (1999)

Negative Ion Resonances in Surface Dynamics: New Results and Applications

in "New Directions in Atomic Physics", eds. C.T. Whelan et al (Plenum Press, New York, 1999), p. 153
L. Siller and R.E. Palmer

Resonance scattering is an important type of low energy (1 - 30 eV) inelastic electron scattering from diatomic and polyatomic molecules in both the gas phase and in adsorbed or condensed phases. The negative ion resonance (NIR) scattering mechanism is a short range scattering event in which the scattered electron is temporarily trapped in an unoccupied anti-bonding orbital of the target molecule, leading to the enhancement of the vibrational excitation cross-section.

The interaction of molecules with surfaces is dependent on the molecular-surface separation, the lateral position of the molecule within the surface unit cell and the molecular orientation as well as the vibrational, rotational and electronic states of the molecule. Study of the negative ion resonances of adsorbed molecules, especially in the case when they are weakly bonded (via van der Waals forces) to a surface and comparison of the resonant energy and lifetimes with the corresponding gas phase behaviour is a valuable starting point



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