New measurements of spontaneous transition probabilities for beryllium-like ions

Details New measurements of spontaneous transition probabilities for beryllium-like ions New measurements of spontaneous transition probabilities for beryllium-like ions

Jan 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987jphb...20...43l&link_type=abstract

Journal of Physics B - Atomic and Molecular Physics (ISSN 0022-3700), vol. 20, Jan. 14, 1987, p. 43-55.

Physics

Atomic Physics

22

Electric Dipoles, Metal Ions, Radiative Transfer, Spectral Line Width, Transition Probabilities, Atomic Physics, Beryllium, Solar Spectra, Spectrometers, Stellar Spectra, Ultraviolet Radiation

Scientific paper

Measurements of spectral line intensities are presented for pairs of transitions having common upper levels and thus derive the branching ratios of their spontaneous radiative transition probabilities. These are then combined with the results of measurements of the radiative lifetimes of the upper levels by other authors to obtain values of the individual transition probabilities. Care was taken to avoid the effects of the trapping of resonance radiation, which could have invalidated the results. A particular feature of these measurements was the use of two spectrometers, spanning between them the wavelength range from less than 100 to over 7000 A. The results are for transitions in N IV, O V and Ne VII and are given with a claimed accuracy of between 7 and 38 percent. These are compared with theoretically calculated values. Good agreement is found for some of the simpler electric dipole transitions. On the other hand, for some of the other transitions, which in certain cases are only possible because of configuration interaction, disparities between the present measurements and theory are as large as a factor of five.

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