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The expectation values of the various geometric parameters were determined for the ground state of the Ps - ion. The evaluated (e + ,e - ) pair annihilation rate in Ps - is approximately 2.086121*10 9 s -1 . The mass dependence of a number of geometric parameters for symmetric negative ions such as X - X - Z + where mX
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Alexei M. Frolov (1993) studied this question.
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