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Threshold Behavior of Inelastic-Scattering Cross Sections

J. N. Bardsley, R. K. Nesbet

Open publisher page 37 citations

Abstract

The behavior of scattering cross sections near an excitation threshold is examined for the case of long-range potentials. The theory is confirmed by computations of $e\ensuremath{-}\mathrm{L}\mathrm{i}$ scattering. Recent observations of threshold structure in $e\ensuremath{-}\mathrm{N}\mathrm{a}$ collisions are ascribed to a $^{1}D$ resonance of ${\mathrm{Na}}^{\ensuremath{-}}$. A true cusp should occur only in the $^{1}P$ partial cross section.

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What this paper is about

The behavior of scattering cross sections near an excitation threshold is examined for the case of long-range potentials. The theory is confirmed by computations of $e\ensuremath{-}\mathrm{L}\mathrm{i}$ scattering. Recent observations of threshold structure in $e\ensuremath{-}\mathrm{N}\mathrm{a}$ collisions are ascribed to a $^{1}D$ resonance of ${\mathrm{Na}}^{\ensuremath{-}}$. A true cusp should occur only in the $^{1}P$ partial cross section.

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Available abstract

The behavior of scattering cross sections near an excitation threshold is examined for the case of long-range potentials. The theory is confirmed by computations of $e\ensuremath{-}\mathrm{L}\mathrm{i}$ scattering. Recent observations of threshold structure in $e\ensuremath{-}\mathrm{N}\mathrm{a}$ collisions are ascribed to a $^{1}D$ resonance of ${\mathrm{Na}}^{\ensuremath{-}}$. A true cusp should occur only in the $^{1}P$ partial cross section.

Key concepts: Physics, Scattering, Inelastic scattering, Cross section (physics), Atomic physics, Excitation, Resonance (particle physics), Cusp (singularity)

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