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Abstract
A new method is described for determining neutral atomic and molecular lifetimes, by measuring delayed coincidences between inelastically scattered electrons and the subsequent decay photons. The method has been applied to three states in helium (3 3D, 4 3S and 4 1S), to the C 3Π u state in nitrogen and the a 3Σ g + state in hydrogen. Apart from the 4 1S lifetime, all the above measurements are thought to be free from cascade and other systematic errors.
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