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Natural radiative lifetimes have been determined in the 5snd ' D2 sequences of strontium in the perturbed region around n =15. Stepwise laser excitations and pulse modulation of a cw dye-laser beam were employed. A plot of the measured lifetime values versus the effective quantum number reveals complex configuration interaction.

Spatially resolved temperature measurements in a CH 4 -air flame have been achieved using two-line laser-induced fluorescence from indium atoms seeded to the flame.

Natural radiative lifetimes in the perturbed 6sns ~D 2 (n= 12-30) sequence of barium have been measured using the PUMOLS (PUlse-MOdulated Laser Spectroscopy) method, which incorporates pulse-modulation of a CW dye-laser beam and delayed coincidence techniques. Principal perturbers are the 5d 7d 3F 2 and ~D 2 states. Lifetimes were also measured for these shortlived valence states, which through configuration mixing cause drastic decreases in lifetime values in the region of perturbation of the 6snd 1D z sequence. Two-step laser excitation from the ground 6s 2 ~So state via the 6s 6p 1p~ state was employed. Special care was taken to determine the influence of black-body radiation transitions on the measured lifetimes.

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