The FERRUM project: Experimental transition probabilities from highly excited even 5s levels in Cr ii
نویسندگان
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...
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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...
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We report on experimental branching fractions (BFs) for 19 transitions from the three 3d5(6S)4s4p(3P) y6P levels in Fe II, measured in Fourier transform spectra of a Penning discharge lamp and a hollow cathode lamp. The transition wavelengths span the interval between 1600 and 2850 Å. Absolute oscillator strengths ( f -values) have been derived by combining the BFs with experimental radiative l...
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An abstract should be given The macroscopic quantizations of matter into macro-atoms and radiant and thermal energies into r-and k-energy packets initiated in Paper I is completed with the definition of transition probabilities governing energy flows to and from the thermal pool. The resulting Monte Carlo method is then applied to the problem of computing the hydrogen spectrum of a Type II supe...
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Transition probabilities are calculated for individual and multiplet lines between some excited states in neutral sodium by using the weakest bound electron potential model theory. In the determination of parameters required for calculation of transition probabilities, we employed numerical non-relativistic Hartree–Fock wave functions for expectation values of radii in all levels. The necessary...
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ژورنال
عنوان ژورنال: Astronomy & Astrophysics
سال: 2014
ISSN: 0004-6361,1432-0746
DOI: 10.1051/0004-6361/201424762