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Lego Figure holding a lego telescope. Photo

Henrik Hartman

Researcher (Leave of Absence)

Lego Figure holding a lego telescope. Photo

The FERRUM project: Experimental transition probabilities from highly excited even 5s levels in Cr II

Author

  • Lars Engström
  • Hans Lundberg
  • Hampus Nilsson
  • Henrik Hartman
  • E. Backstrom

Summary, in English

We report lifetime measurements of the five levels in the 3d(4)(a(5)D)5s e(6)D term in Cr II at an energy around 83 000 cm(-1), and log(gf) values for 38 transitions from the investigated levels. The lifetimes are obtained using time-resolved, laser-induced fluorescence on ions from a laser-produced plasma. Since the levels have the same parity as the low-lying states directly populated in the plasma, we used a two-photon excitation scheme. This process is greatly facilitated by the presence of the 3d(4)(a(5)D)4p z(6)F levels at roughly half the energy difference. The f-values are obtained by combining the experimental lifetimes with branching fractions derived using relative intensities from a hollow cathode lamp recorded with a Fourier transform spectrometer.

Department/s

  • Atomic Physics
  • Lund Observatory - Undergoing reorganization

Publishing year

2014

Language

English

Publication/Series

Astronomy & Astrophysics

Volume

570

Document type

Journal article

Publisher

EDP Sciences

Topic

  • Astronomy, Astrophysics and Cosmology
  • Atom and Molecular Physics and Optics

Keywords

  • atomic data
  • methods: laboratory: atomic
  • techniques: spectroscopic

Status

Published

ISBN/ISSN/Other

  • ISSN: 0004-6361