2016 Articles

# Recombination of W19+ ions with electrons: Absolute rate coefficients from a storage-ring experiment and from theoretical calculations

Experimentally measured and theoretically calculated rate coefficients for the recombination of W 19 + ( [ Kr ] 4 d 10 4 f 9 ) ions with free electrons (forming W 18 + ) are presented. At low electron-ion collision energies, the merged-beam rate coefficient is dominated by strong, mutually overlapping, recombination resonances as already found previously for the neighboring charge-state ions W 18 + and W 20 + . In the temperature range where W 19 + is expected to form in a collisionally ionized plasma, the experimentally derived recombination rate coefficient deviates by up to a factor of about 20 from the theoretical rate coefficient obtained from the Atomic Data and Analysis Structure database. The present calculations, which employ a Breit–Wigner redistributive partitioning of autoionizing widths for dielectronic recombination via multi-electron resonances, reproduce the experimental findings over the entire temperature range.Experimentally measured and theoretically calculated rate coefficients for the recombination of W 19 + ( [ Kr ] 4 d 10 4 f 9 ) ions with free electrons (forming W 18 + ) are presented. At low electron-ion collision energies, the merged-beam rate coefficient is dominated by strong, mutually overlapping, recombination resonances as already found previously for the neighboring charge-state ions W 18 + and W 20 + . In the temperature range where W 19 + is expected to form in a collisionally ionized plasma, the experimentally derived recombination rate coefficient deviates by up to a factor of about 20 from the theoretical rate coefficient obtained from the Atomic Data and Analysis Structure database. The present calculations, which employ a Breit–Wigner redistributive partitioning of autoionizing widths for dielectronic recombination via multi-electron resonances, reproduce the experimental findings over the entire temperature range.

## Files

- Badnell2016PRA93_052703.pdf application/pdf 517 KB Download File

## Also Published In

- Title
- Physical Review A
- DOI
- https://doi.org/10.1103/PhysRevA.93.052703

## More About This Work

- Academic Units
- Astrophysics Laboratory
- Published Here
- September 7, 2017