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Measurement of natural radiative lifetime of excited levels of Tm atom

Chengfei Wang, Zhankui Jiang, Zhou Dafan, Xiu-Qing Liang

Published Oct 1, 1988• 0 citations
OpenAlex

Abstract

The natural radiative lifetime of some low-lying excited levels in Tm atoms have been determined from measurements of time-resolved laser-induced fluorescence in atomic beam. The levels were selectively populated by the light from a pulsed tunable dye laser pumped by an excimer laser or a Nd:YAG laser.

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An established photoionization branching-ratio measurement method, in which an excited level of an atom is populated by a pulsed laser from the ground level and repopulation of the ground level is measured by a second laser or lasers, is extended to the case with a finite lower-level lifetime. Two pulsed dye lasers populate the upper and the lower levels of the transition of interest. A third pulsed dye laser probes the time evolution of the lower level by a photoionization process. This measurement, coupled with the upper- and the lower-level lifetimes, permits the determination of the branching ratio and transition probability. Cerium branching ratios obtained are compared with those that we determined from the emission spectrum of cerium. The method is tested for the difficult case in which the lifetimes of the transition levels are nearly equivalent. The effects of magnetic sublevels are investigated in ytterbium.
We have measured the radiative lifetimes of ns, np and nd Rydberg states of rubidium in the range 28 < n < 45. To enable long-lived states to be measured, our experiment uses slow-moving Rb atoms in a magneto-optical trap (MOT). Two experimental techniques have been adopted to reduce random and systematic errors. First, a narrow-bandwidth pulsed laser is used to excite the target Rydberg state, resulting in minimal shot-to-shot variation in the initial state population. Second, we monitor the target state population as a function of time delay from the laser pulse using a short-duration, millimetre-wave pulse that is resonant with a one- or two-photon transition. We then selectively field ionize the monitor state, and detect the resulting electrons with a micro-channel plate. This signal is an accurate mirror of the target state population, and is uncontaminated by contributions from other states which are populated by black body radiation. Our results are generally consistent with other recent experimental results obtained using a less sensitive method, and are also in excellent agreement with theory.