Abstract
Radiative lifetimes of the a4Πu metastable state of O+− have been measured by using an electrostatic ion storage ring. Neutral products from metastable decay processes as well as those by collisions with residual gases were monitored as a function of the ion-storage time. To observe the metastable decay of a specific quantum state in the a4Πu state, photodissociation of the metastable ion was induced by a tunable laser with a wavelength from 494 to 500 nm. A long-lived component of the order of seconds has been found in the decay curves in addition to two lifetime components of the order of milliseconds and hundreds of milliseconds.
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