Abstract

Precision measurements of excited‐state lifetimes play important roles in many areas of physics. Measurements of atomic lifetimes are used to determine fundamental interaction parameters, test atomic and molecular theory, and place constraints on models of stellar evolution and big‐bang nucleosynthesis. A variety of techniques for measuring atomic and molecular lifetimes are presented along with a discussion of associated systematic effects. A comparison is made between experimental and theoretical results for a variety of alkali and alkali‐like systems. Lifetime measurements in cesium are used to test atomic‐structure calculations necessary for the interpretation of parity nonconservation experiments.

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