Lifetimes of transitions in the visible range in neutral sulphur

Abstract

Radiative lifetimes of 8 different multiplets in the visible range in neutral sulphur have been directly measured using the High Frequency Deflection technique. These lifetimes have not been experimentally studied earlier. The results are compared to Coulomb approximation calculations and semiempirical estimates of the associated oscillator strengths.

Resonance and intersystem transition lines of astrophysical importance in neutral sulfur

“…Large discrepancies also occur for the lifetime of the 3s 2 3p 3 ( 4 S o )4s 5 S o 2 level. Our results tend to agree with the same order of magnitude as that of Mason [29] whereas the measurement of Delalić et al [10] reported nearly half of our value. Nevertheless, this [10] measured value (9200 ns) was analysed [29] to be the maximum value their experimental setup can reach.…”

“…Comparison of radiative lifetimes (in nanoseconds) for some sulfur levels. The superscripts in the last column (a), (b), (c), (d) and (e) stand for the references [10], [16], [17], [28] and [29] respectively. ZB: Zatsarinny and Bartschat [18].…”

“…But this calculation includes correlation using a small number of configurations. On the experimental side Doering [8], Federman et al [9], Delalić et al [10] and Berzinsh et al [11] presented results for lifetimes of several levels of sulfur and associated transition data using time-resolved laser spectroscopy or the Goddard High-Resolution Spectrograph on board the Hubble Space Telescope. In another investigation Biémont et al [12] presented some lifetime measurements and combining these with theoretical branching ratios they also presented some oscillator strengths for resonance transitions.…”

Oscillator strengths and radiative rates for transitions in neutral sulfur

“…Federman and Cardelli [6] reported a number of f-values for a wide range of wavelengths. Earlier measurements of f-values for transitions among some of the above multiplets were also reported by Savage and Lawrence [7], Mü ller [8], Delalić et al [9], and Doering [10].…”

Radiative lifetimes in neutral tellurium measured by time-resolved laser spectroscopy

“…However, lifetime measurements of higher electron configurations for the lighter elements in the oxygen subgroup have been performed. Kr611 et al in 1985 used two-photon excitation on oxygen atoms [12] and Delalic et al in 1990 used electron-beam excitation on sulphur [13]. In the present work we have continued our investigations of radiative lifetimes of the tellurium atom by using step-wise pulsed dye laser exci- tations.…”