The FERRUM project: experimental lifetimes of highly excited Fe II 3d64p levels and transition probabilities
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چکیده
منابع مشابه
The FERRUM project: Transition probabilities for forbidden lines in [Fe ii] and experimental metastable lifetimes
Context. Accurate transition probabilities for forbidden lines are important diagnostic parameters for low-density astrophysical plasmas. In this paper we present experimental atomic data for forbidden [Fe ii] transitions that are observed as strong features in astrophysical spectra. Aims. To measure lifetimes for the 3d(G)4s a 4G11/2 and 3d (D)4s b 4D1/2 metastable levels in Fe ii and experime...
متن کاملFe II lifetimes and transition probabilities
Received Abstract. Fe II radiative lifetimes were measured applying the time-resolved nonlinear laser-induced fluoresence technique. We investigated 21 levels of up to 47000 cm −1. 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 spectromete...
متن کاملThe FERRUM Project : Experimental and theoretical transition rates of forbidden [ Sc ] lines and radiative lifetimes of metastable Sc levels ⋆
Context. In many plasmas, long-lived metastable atomic levels are depopulated by collisions (quenched) before they decay radiatively. In low-density regions, however, the low collision rate may allow depopulation by electric dipole (E1) forbidden radiative transitions, so-called forbidden lines (mainly M1 and E2 transitions) . If the atomic transition data is known, these lines are indicators o...
متن کاملExperimental and theoretical lifetimes and transition probabilities in Sb I
We present experimental atomic lifetimes for 12 levels in Sb I. The levels belong to the 5p2(3P )6s 2P , 4P , and 5p2(3P )5d 4P , 4F , and 2F terms. The lifetimes were measured using time-resolved laser-induced fluorescence. In addition, we report calculations of transition probabilities in Sb I using a multiconfigurational Dirac-Hartree-Fock method. The physical model was tested through compar...
متن کاملExperimental and theoretical studies of lifetimes and transition probabilities for Au II
We report lifetime measurements for three of the 5d96p levels in Au II and relativistic multiconfiguration Dirac–Fock (MCDF) calculations of lifetimes and transitions probabilities in this ion. The work was motivated by significant disagreements between previous experimental 5d96p lifetimes, obtained by means of the beam–foil (BF) method and theoretical data based on Hartree–Fock calculations i...
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ژورنال
عنوان ژورنال: Journal of Physics B: Atomic, Molecular and Optical Physics
سال: 1999
ISSN: 0953-4075,1361-6455
DOI: 10.1088/0953-4075/32/24/306