Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fe II lifetimes and transition probabilities   Fe II radiative lifetimes were measured applying the time-resolved nonlinear
laser-induced fluoresence technique. We investigated 21 levels of up to 47000
1/cm. The uncertainties are typically 2-3%. The lifetimes provide an improved
absolute scale to our branching fractions which were measured with a Fourier
transform spectrometer and a high-resolution grating spectrometer and which
have been published earlier. We report absolute transition probabilities of 140
Fe II lines in the wavelength range 220-780 nm. The overall uncertainties are
estimated to be 6% for the strong and up to 26% for the weak transitions. The
results are compared with recent experimental data from the literature. Our
large set of accurate data can be used for a reliability check of theoretical
data calculated for iron abundances in astrophysical plasmas.

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The categories of this paper are: q-bio
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
28
The categories of this paper are: alg-geom
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
22
The categories of this paper are: chao-dyn
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
12
The categories of this paper are: nucl-th
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
30
The categories of this paper are: q-alg