Mo Larsson

Wavelengths and energy levels of the 4d95s-4d95p transition array of Xe IX

The spectrum of Xe IX in the 400-1200 ? wavelength region has been obtained by observing the radiation emitted following electron capture by Xe9+ and Xe8+ ion beams incident on a He gas target. The xenon ions were produced by the Uppsala University ECR ion source. Many of the stronger lines were found to originate from 4d95s-4d95p transitions. All levels of the 4d95s and 4d95p configurations have been established. The analysis was assisted by MCDF calculations and isoelectronic comparison.

Wavelengths and energy levels of Xe VII and Xe VIII obtained by collision-based spectroscopy

The Xe VII and Xe VIII spectra have been investigated by collision-based spectroscopy. The radiation emitted following electron capture by 10q keV Xe-q+ ions (q = 6-8) impinging on a He (Ar) gas target has, with some exceptions, been recorded in the 350-8

Collision-based spectroscopy of Xe viii Rydberg states

The photon emission from 60-keV Xe6+ colliding with Na or Ar was recorded in the 35–800-nm wavelength region. Several of the observed lines were classified as transitions from singly excited states in Xe5+. The dipole polarizability of Xe6+ and the ionization energy of Xe5+ were determined from a fit with the polarization formula to the experimentally determined energy levels of nonpenetrating states. The analysis was assisted by Hartree–Fock calculations. All Xe5+ lines in the range 35–800 nm, reported in this work or previously, are tabulated.The photon emission from 60-keV Xe6+ colliding with Na or Ar was recorded in the 35–800-nm wavelength region. Several of the observed lines were classified as transitions from singly excited states in Xe5+. The dipole polarizability of Xe6+ and the ionization energy of Xe5+ were determined from a fit with the polarization formula to the experimentally determined energy levels of nonpenetrating states. The analysis was assisted by Hartree–Fock calculations. All Xe5+ lines in the range 35–800 nm, reported in this work or previously, are tabulated.

Hyperfine structure of the lower configurations in Y II by fast ion beam-laser spectroscopy

The hyperfine structure (hfs) of levels in the configurations 4d5s, 4d2 and 4d5p in Y II has been recorded using fast ion beam-laser spectroscopy. The levels in the 4d5s configuration were excited with frequency doubled laser light to levels in the 4d5p configuration, whereas the levels in the 4d2 configuration were excited by visible laser light. All hfs components could not be observed in the spectra, and therefore the magnetic dipole coupling constants A were evaluated in a parametrization of the peak separations in the framework of the effective operator theory.

Studies of the collision-based Xe vi and Xe vii spectra

Collision-based spectroscopy of a Xeq+(q=6, 7) beam with a target T (T=Na, Ar) has been performed in the 35–800-nm wavelength region. Twenty-five new Xe vi lines and twenty-two new Xe vii lines were classified, twelve new energy levels of Xe vi and nine new energy levels of Xe vii were established, and one energy level of Xe vi was revised from the classified transitions. The analysis was supported by Hartree–Fock calculations.

Photon spectroscopy of slow He2+ + He collisions

Photon emission following slow ion-atom collisions has been observed for the collision system He2+ + He. The energy of the incoming beam of helium ions was varied between 10 keV and 35 keV. In particular, the velocity dependent relative photon emission cross-sections for the 1s2 1S0-1snp 1P1 (n≤4) resonance series in neutral helium are reported and compared with theoretical results. The work has been performed at the Uppsala University ECR ion source facility.

Photon spectroscopy of slow Heq+ + He (q = 1,2) collisions

Abstract Photon emission following slow ion-atom collisions has been observed for the collision systems Heq+ + He(q = 1,2) at the energy 10 keV q−1. In particular relative photon emission cross sections for the 1 s 2 1 S 0 −1s n p 1 P 1 series in neutral helium are reported for both charges of the incoming helium ion. The work has been performed at the Uppsala University ECR ion source facility.