### Abstract

Cross sections for the photoionization (PI) of [Formula Presented] ions with [Formula Presented] ground-state configuration have been measured by employing the merged ion-photon beams method. The [Formula Presented] ions were produced from metallic vapor in an electron cyclotron resonance ion source, and the photon beam was generated by an undulator in the electron-synchrotron storage ring of the advanced light source of the Lawrence Berkeley National Laboratory. The experimental photon energy range 23–68 eV encompasses the direct [Formula Presented] and [Formula Presented] photoionization thresholds. The experimental photoion spectrum is dominated by autoionizing resonances due to [Formula Presented] excitations predominantly decaying via Coster-Kronig and super-Coster-Kronig transitions. Individual resonances located around [Formula Presented] have been measured with an instrumental energy spread [Formula Presented] as low as 1.2 meV, corresponding to a resolving power of [Formula Presented] around 33 500. The fractions of metastable ions in the [Formula Presented] ion beam are obtained by comparing the photoionization cross section with the recently measured [Schippers et al., Phys. Rev. A 65, 042723 (2002)] cross section for the time-reversed process of photorecombination of [Formula Presented] ions. Absolute strengths of several [Formula Presented] and [Formula Presented] PI resonances have been determined. They are the same as the corresponding resonance strengths for isoelectronic [Formula Presented] ions.

Original language | English |
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Number of pages | 1 |

Journal | Physical Review A - Atomic, Molecular, and Optical Physics |

Volume | 67 |

Issue number | 3 |

DOIs | |

Publication status | Published - 2003 |

### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

## Fingerprint Dive into the research topics of 'Photoionization of [Formula Presented] ions by synchrotron radiation: Measurements and absolute cross sections in the photon energy range 23–68 eV'. Together they form a unique fingerprint.

## Cite this

*Physical Review A - Atomic, Molecular, and Optical Physics*,

*67*(3). https://doi.org/10.1103/PhysRevA.67.032702