We report photoabsorption measurements from the 4p inner shell of singly ionized strontium in the spectral region between 26.0 and 37.4 eV. More than 60 levels of Sr II

The photoabsorption spectra of lead and bismuth ions have been recorded using the dual laser plasma (DLP) technique in the photon energy range 30–66 eV. The experimental observations and theoretical calculations are focused on the 5d inner-shell excitations of the Hg I like ions of lead (Pb III) and bismuth (Bi IV). With the aid of Hartree–Fock calculations in the jj coupling scheme, we have identified over 30 new lines in both ions. As a result of the new measurements in Bi IV, the previously determined first ionization potential of Bi III has been increased from 45.32 eV to 45.36 eV.

Type of publicationArticle (peer-reviewed) Photoionization spectra have been recorded in the 4s, 4p, and 3d resonance regions for the Kr I isoelectronic sequence using both the dual laser produced plasma ͑DLP͒ technique ͑at DCU͒ to produce photoabsorption spectra, and the merged ion beam and synchrotron radiation technique ͑at ASTRID͒ to measure absolute photoionization cross sections. Profile parameters are compared for the 4s-np resonances of Rb + and Sr 2+ . Many 4p → ns, md transitions are identified with the aid of Hartree-Fock calculations, and consistent quantum defects are observed for the various ns and md Rydberg series. Absolute single and double photoionization cross sections recorded in the 3d region for Rb + and Sr 2+ ions show preferential decay via double photoionization. This is only the second report to our knowledge where both the DLP technique and the merged-beam technique have been used simultaneously to record photoionization spectra, and the advantages of both techniques ͑i.e., better resolution in the case of DLP and values for absolute photoionization cross sections in the case of the merged-beam technique͒ are highlighted.