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

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

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Publication Article, peer reviewed scientific
Title The FERRUM project : Experimental transition probabilities from highly excited even 5s levels in Cr ii
Author(s) Engström, L ; Lundberg, H ; Nilsson, Hampus ; Hartman, Henrik ; Bäckström, E
Date 2014
English abstract
We report lifetime measurements of the five levels in the 3d4(a5D)5s e6D term in Cr ii at an energy around 83 000 cm-1, and log(g f ) 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 3d4(a5D)4p z6F levels at roughly half the energy di erence. 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.
DOI http://dx.doi.org/10.1051/0004-6361/201424762 (link to publisher's fulltext)
Publisher EDP Sciences
Host/Issue Astronomy and Astrophysics;
Volume 570
ISSN 0004-6361
Pages A34
Language eng (iso)
Subject(s) atomic data – methods
laboratory
atomic – techniques
spectroscopic
Sciences
Research Subject Categories::NATURAL SCIENCES
Handle http://hdl.handle.net/2043/20006 (link to this page)

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