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BROAD SHAPE RESONANCE EFFECTS IN CaF RYDBERG STATES

Please use this identifier to cite or link to this item: http://hdl.handle.net/1811/30914

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Title: BROAD SHAPE RESONANCE EFFECTS IN CaF RYDBERG STATES
Creators: Altunata, Serhan N.; Coy, Stephen L.; Field, R. W.
Issue Date: 2006
Abstract: Results of \itshape{ab-initio }\upshape R-matrix calculations } indicate the presence of a broad shape resonance in electron-$CaF^+$ scattering for the $^2\Sigma^+$ electronic symmetry near the ionization threshold. The properties of this shape resonance are analyzed using the adiabatic partial-wave expansion of the scattered electron wavefunction introduced by Le Dourneuf et. al. } The qualitative aspects of the shape resonance are explained by an adiabatic approximation on the electronic motion. Mulliken's rule for the structure of Rydberg state wavefunctions } specifies that, except for an $(n^*)^{-3/2}$ scale factor, every excited state wavefunction within a Rydberg series is build on an innermost lobe that remains invariant in shape and nodal position as a function of excitation energy. Mulliken's rule implies a weak energy dependence of the quantum defects for an unperturbed molecular Rydberg series, which is given by the Rydberg-Ritz formula. This zero-prder picture is violated by a single $^2\Sigma^+$ $CaF$ Rydberg series at all Rydberg state energies ($n^* \geq 5$, increasingly with $n^*$) below the ionization threshold, under the broad width of the shape resonance. Such a violation is diagnostic of a \itshape global \upshape "scarring" of the Rydberg spectrum, which is distinct from more familiar \itshape local \upshape level perturbations.
URI: http://hdl.handle.net/1811/30914
Other Identifiers: 2006-MI-11
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