### Abstract

The absolute total recombination reaction rate coefficients for Be-like C, N, and O have been measured using the CRYRING storage ring and compared with the results from distorted-wave theory. For the theory results, it is found that shifts to NIST energy values for the core excited energies of the recombining system are not sufficient to accurately match all of the resonance positions and heights at lower energies. These theory results represent the quality of most archived theory DR data. The accurate calculation of these low energy resonances still presents a significant challenge to theory. In addition, trielectronic recombination resonances, associated with the formation of triply excited states during recombination, have been observed in the total recombination reaction rate coefficient spectra of N3+ and O4+. Finally, we construct a dielectronic recombination Maxwellian rate coefficient from the experimental results for low n resonances, and from the theoretical results for high n resonances. In the case of O4+, the trielectronic recombination resonances have a strong influence on the low temperature Maxwellian rate coefficient. Our best hybrid Maxwellian rate coefficient is compared with archived distorted-wave theory data, and is found to be in reasonable agreement, even at the low temperatures.

Original language | English |
---|---|

Pages (from-to) | 757-766 |

Number of pages | 10 |

Journal | Experimental Astronomy |

Volume | 442 |

Issue number | 2 |

DOIs | |

Publication status | Published - Nov 2005 |

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### Keywords

- atomic
- molecular and nuclear data
- finite density plasmas
- dielectronic recombination
- isoelectronic sequence
- radiative recombination
- low temperatures
- coefficients
- carbon
- argon

### Cite this

*Experimental Astronomy*,

*442*(2), 757-766. https://doi.org/10.1051/0004-6361:20040559

}

*Experimental Astronomy*, vol. 442, no. 2, pp. 757-766. https://doi.org/10.1051/0004-6361:20040559

**Electron-ion recombination of Be-like C, N, and O.** / Fogle, M.; Badnell, N.R. ; Glans, P.; Loch, S.D. ; Madzunkov, S.; Abdel-Naby, S.A. ; Pindzola, M.S. ; Schuch, R.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Electron-ion recombination of Be-like C, N, and O

AU - Fogle, M.

AU - Badnell, N.R.

AU - Glans, P.

AU - Loch, S.D.

AU - Madzunkov, S.

AU - Abdel-Naby, S.A.

AU - Pindzola, M.S.

AU - Schuch, R.

PY - 2005/11

Y1 - 2005/11

N2 - The absolute total recombination reaction rate coefficients for Be-like C, N, and O have been measured using the CRYRING storage ring and compared with the results from distorted-wave theory. For the theory results, it is found that shifts to NIST energy values for the core excited energies of the recombining system are not sufficient to accurately match all of the resonance positions and heights at lower energies. These theory results represent the quality of most archived theory DR data. The accurate calculation of these low energy resonances still presents a significant challenge to theory. In addition, trielectronic recombination resonances, associated with the formation of triply excited states during recombination, have been observed in the total recombination reaction rate coefficient spectra of N3+ and O4+. Finally, we construct a dielectronic recombination Maxwellian rate coefficient from the experimental results for low n resonances, and from the theoretical results for high n resonances. In the case of O4+, the trielectronic recombination resonances have a strong influence on the low temperature Maxwellian rate coefficient. Our best hybrid Maxwellian rate coefficient is compared with archived distorted-wave theory data, and is found to be in reasonable agreement, even at the low temperatures.

AB - The absolute total recombination reaction rate coefficients for Be-like C, N, and O have been measured using the CRYRING storage ring and compared with the results from distorted-wave theory. For the theory results, it is found that shifts to NIST energy values for the core excited energies of the recombining system are not sufficient to accurately match all of the resonance positions and heights at lower energies. These theory results represent the quality of most archived theory DR data. The accurate calculation of these low energy resonances still presents a significant challenge to theory. In addition, trielectronic recombination resonances, associated with the formation of triply excited states during recombination, have been observed in the total recombination reaction rate coefficient spectra of N3+ and O4+. Finally, we construct a dielectronic recombination Maxwellian rate coefficient from the experimental results for low n resonances, and from the theoretical results for high n resonances. In the case of O4+, the trielectronic recombination resonances have a strong influence on the low temperature Maxwellian rate coefficient. Our best hybrid Maxwellian rate coefficient is compared with archived distorted-wave theory data, and is found to be in reasonable agreement, even at the low temperatures.

KW - atomic

KW - molecular and nuclear data

KW - finite density plasmas

KW - dielectronic recombination

KW - isoelectronic sequence

KW - radiative recombination

KW - low temperatures

KW - coefficients

KW - carbon

KW - argon

U2 - 10.1051/0004-6361:20040559

DO - 10.1051/0004-6361:20040559

M3 - Article

VL - 442

SP - 757

EP - 766

JO - Experimental Astronomy

JF - Experimental Astronomy

SN - 0922-6435

IS - 2

ER -