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
Y1 - 2003
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.
UR - https://www.scopus.com/pages/publications/85037180863
U2 - 10.1103/PhysRevA.67.032702
DO - 10.1103/PhysRevA.67.032702
M3 - Article
AN - SCOPUS:85037180863
SN - 1050-2947
VL - 67
SP - 13
JO - Physical Review A - Atomic, Molecular, and Optical Physics
JF - Physical Review A - Atomic, Molecular, and Optical Physics
IS - 3
ER -