Negative ion resonances

H.S. Taylor, J.K. Williams, Proposed theory of calculating the energy of negative-ion resonant elastic scattering states and of the pre-ionization states of electronic spectroscopy, J. Chem. Phys. 42 (1965) 4063. 

A third mechanism, first observed in gas-phase electron-impact scattering, has been referred to as negative-ion resonance. In this process, an electron is trapped, within 10 s, inside the molecule in a negative-ion state. For chemisorbed molecules, however, the adsorbate-substrate chemical bond and the electron-surface interactions can dramatically alter the resonance properties. Hence, for HREELS at metal surfaces, this mechanism is quite rare it will not be treated further in this article. 

S.J. Buckman, C.W. Qark, Atomic negative-ion resonances. Rev. Mod. Phys. 66 (1994) 539. [51 ] Ph. Durand, 1. Paidarova, Modeling quantum resonances 11. Overview of collision theory, in J. Maruani, R. Lefebvre, E. Brandas (Eds.), Advanced Topics in Theoretical Chemical Physics, Vol. 12 Progress in Theoretical Chemishy and Physics, Kluwer Academic, Dordrecht, 2003, p. 295... 

Calculations of state-specific and of the corresponding potential energy surfaces of negative ion resonances and of diabatic states in molecules... 

There are three important scattering mechanisms in HREELS dipole scattering, impact scattering and negative ion resonance scattering. 

Illenberger, E. 2003. Formation and evolution of negative ion resonances at surfaces. SurfSci 528 61-11. 

Potential Energy Surfaces for Short-lived Negative-ion (Resonance)... 

V. POTENTIAL ENERGY SURFACES FOR SHORT-LIVED NEGATIVE-ION (RESONANCE) STATES... 

Another possibility is the analysis of ejected electron spectra due to electron impact excitation of autoionizing states via a negative-ion resonance. One example, investigated by van de Water and Heideman, is the excitation of He(2s ) 5 via the negative resonance He (2s2p ) D. Several processes can lead to the same final state ... 

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