Advances in Atomic and Molecular Physics, Vol. 22 by David and Benjamin Bederson Bates

By David and Benjamin Bederson Bates

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In contrast the polarized orbital results of Mandal et al. (1976) greatly overestimate the positronium formation cross section just above the threshold, due to a resonant-like feature in the p wave, but then rapidly become too low. Most of these results exhibit the dominance of the d-wave contribution to the positronium formation cross section found also in positron- hydrogen scattering. Also, whenever differential cross sections for positronium formation have been calculated, they are found to be peaked in the forward direction and become even more so as the positron energy is raised.

1 986). In “Positron (Electron)Gas Scattering” (W. E. Kauppila and T. S. ). World Scientific, Singapore, in press. , and Ohmura, H. (1965). Phys. Rev. 118, 154. Ore, A. (1946). Phys. Rev. 70,90. Ore, A. (1947). Phys. Rev. 71,913. Page, B. A. P. (1976). J. Phys. B 9, 11 1 I. Page, B. A. , and Fraser, P. A. (1 974). J. Phys. B 7, L389. , and Poe, R. T. (1975). Phys. 51A, 431. Schwartz,C. (1961a). Phys. Rev. 124, 1468. Schwartz, C. (1 96 I b). Phys. Rev. 123, 1700. Seller, G. , Oberoi, R. , and Callaway, J.

This value is very close to the appropriately weighted average ( 1 to 3) of the annihilation rates for singlet and triplet free positronium and therefore implies that the configuration of Ps- is, as expected, an electron weakly bound to positronium. Bhatia and Drachman also investigatedthe possibility of a 'Pebound state of Ps-. Mills (1 98 lb) had speculated that the state, to be thought of as an electron weakly bound to positronium in the n = 2 state, might exist, although his subsequent theoretical investigations suggested that this was not so.

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