Open AccessRadiative lifetimes, branching fractions and transition probabilities in Ge I ‐‐ solar implications
Author(s) -
Biémont E.,
Lyngå C.,
Li Z. S.,
Svanberg S.,
Garnir H. P.,
Doidge P. S.
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.02230.x
Subject(s) - physics , radiative transfer , atomic physics , spectrometer , collisional excitation , branching fraction , excitation , laser , computational physics , astrophysics , optics , ion , ionization , quantum mechanics
New radiative lifetimes have been measured for the 5s 3 P o 0,1,2 and 5s 1 P o 1 levels of Ge I using a laser‐produced plasma subject to selective laser excitation. A diffraction grating based emission spectrometer of moderately high resolution has been used to remeasure the branching ratios of the 4p‐‐5s depopulating transitions. The oscillator strengths of astrophysical interest, which have been derived from these new data, are compared with theoretical values calculated within a pseudo‐relativistic Hartree‐‐Fock approach. The new set of f‐values has been compared with the few results available in the literature, which are generally characterized by a large scatter and a low accuracy. The solar photospheric abundance of germanium deduced from the new atomic data of the present work is A Ge = 3.58 ± 0.05, on the usual logarithmic scale, in agreement with the meteoritic value.