### 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 |
---|---|

Number of pages | 1 |

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

Volume | 67 |

Issue number | 3 |

DOIs | |

Publication status | Published - Jan 1 2003 |

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### ASJC Scopus subject areas

- Atomic and Molecular Physics, and Optics

### Cite this

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

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

**Photoionization of [Formula Presented] ions by synchrotron radiation : Measurements and absolute cross sections in the photon energy range 23–68 eV.** / Schippers, S.; Müller, A.; Ricz, S.; Bannister, M. E.; Dunn, G. H.; Schlachter, A. S.; Hinojosa, G.; Cisneros, C.; Aguilar, A.; Covington, A. M.; Gharaibeh, M. F.; Phaneuf, R. A.

Research output: Contribution to journal › Article

*Physical Review A - Atomic, Molecular, and Optical Physics*, vol. 67, no. 3. https://doi.org/10.1103/PhysRevA.67.032702

}

TY - JOUR

T1 - Photoionization of [Formula Presented] ions by synchrotron radiation

T2 - Measurements and absolute cross sections in the photon energy range 23–68 eV

AU - Schippers, S.

AU - Müller, A.

AU - Ricz, S.

AU - Bannister, M. E.

AU - Dunn, G. H.

AU - Schlachter, A. S.

AU - Hinojosa, G.

AU - Cisneros, C.

AU - Aguilar, A.

AU - Covington, A. M.

AU - Gharaibeh, M. F.

AU - Phaneuf, R. A.

PY - 2003/1/1

Y1 - 2003/1/1

N2 - 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.

AB - 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.

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U2 - 10.1103/PhysRevA.67.032702

DO - 10.1103/PhysRevA.67.032702

M3 - Article

AN - SCOPUS:85037180863

VL - 67

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 3

ER -