By David and Benjamin Bederson Bates
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Extra resources for Advances in Atomic and Molecular Physics, Vol. 22
In “Positron Scattering in Gases” (J. W. Humberston and M. R. C. ), p. 165, Plenum, New York. McEachran, R. , Stauffer, A. , and Campbell, L. E. M. (1980). J. Phys. B 13, 1281. McKinley, J. M. (1986). In “Positron (Electron)-Gas Scattering” (W. E. Kauppila and T. S. ). World Scientific, Singapore, in press. , Ghosh, A. , and Sil, N. C. (1975). J. Phys. B 8,2377. , and Ghosh, A. S . (1 976). J. Phys. B 9, 2633. , and Sil, N. C. (1979). J. Phys. B 12,2913. Massey, H. S. W. (1971). Con$ At. , 2nd, 1970p.
W. 46 A. This function is plotted in Fig. 16. A similar approximation applied to the photodetachment of H- (Ohmura and Ohmura, 1965; Bell and Kingston, 1967) was found to give quite accurate results, and it is expected to be equally satisfactory here. This has recently been confirmed at all but very short wavelengths by the calculations of Ward et al. (1986b), in which accurate variational wave functions were used for the initial and final states. 283 X lo3 A), however, the photodetachment cross section exhibits a sharp rise due to a cusp-like feature in the electron-positronium singlet p-wave phase shift.
Thus, the e+e-p+ system is still not bound (Armour, 1983), but the singlet e+e-e+ system, or its antisystem e-e+e- (the positronium negative ion, Ps-), is bound. This was established theoretically by Wheeler ( 1946)and first detected experimentally by Mills ( 1981a). 3266769 eV. exp[-((yr, + Sr2)])ry2 i where rl and r2 are the coordinates of the two electrons relative to the positron and r12= Ir, - r21. All terms with li mi niS o were included and the most elaborate trial function contained 220 terms (o= 9).
Advances in Atomic and Molecular Physics, Vol. 22 by David and Benjamin Bederson Bates