Electron-impact ionization and excitation of helium to the n = 1-4 ionic states

Date

2006-06-07

Authors

Bellm, Susan
Lower, Julian
Bartschat, Klaus R

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Volume Title

Publisher

American Physical Society

Abstract

We present high-precision (e,2e) measurements and calculations for the e-He four-body Coulomb breakup problem. Cross-section ratios for ionization and excitation of the first three excited states of He+ relative to the ground state have been measured for incident energies between 112 and 319 eV. Comparing the data with predictions from a state-of-the-art hybrid distorted-wave+convergent  R matrix with pseudostates (close coupling) approach shows that treating the projectile-target interaction at least to second order is crucial to obtain reasonable agreement between theory and experiment. Nevertheless, our benchmark studies reveal significant theoretical problems for the symmetric energy-sharing cases, thus indicating the need for further improvement.

Description

Keywords

Keywords: Coulomb blockade; Electrons; Ground state; Impact ionization; Ionic conduction; Problem solving; Wave equations; Electron-impact ionization; Incident energies; Projectile-target interaction; Helium

Citation

Physical Review Letters 96.22 (2006): 223201/1-4

Source

Physical Review Letters

Type

Journal article

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DOI

10.1103/PhysRevLett.96.223201

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