By David and Benjamin Bederson Bates
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For the same reason the further approximation can be made of dropping the exchange terms in V/R- and v/k and only retaining the term R R2 in QL. -0 L V / Ln . d / C / / / \ / \ \ \ \ / 0 5 10 15 20 Wavelength h 25 ( 30 35 LO lo3 A ) FIG. 16. Photodetachment cross section for Ps- according to Bhatia and Drachman ( 1986). J. 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.
Lett. 55,488. Tisenko, Yu. (1981). Sov. Phys. J. 24,99. Ward, S. , Humberston, J. , and McDowell, M. R. C. (1985). J. Phys. B 18, L525. Ward, S. , Humberston, J. , and McDowell, M. R. C. (1986a). J. Phys. B, to be published. Ward, S. , McDowell, M. R. , and Humberston, J. W. (1986b). Europhysics Lett. 1, 167. Wheeler, J. A. (1946). Ann. Y. Acad. Sci. 48,219. Winick, J. , and Reinhardt, W. P. (1978). Phys. Rev. A 18, 925. ADVANCES IN ATOMlC AND MOLECULAR PHYSICS. VOL 22 EXPERIMENTAL ASPECTS OF POSITRON AND POSITRONIUM PHYSICS T.
Phys. Rev. A 18, 925. ADVANCES IN ATOMlC AND MOLECULAR PHYSICS. VOL 22 EXPERIMENTAL ASPECTS OF POSITRON AND POSITRONIUM PHYSICS T. C. GRIFFITH Department of Physics and Astronomy University College London London WClE 6BT, England I. Introduction Positron physics has, during the past few years, experienced a period of rapid expansion resulting from the application of positron beams of well-defined energies to an increasing range of experiments. The development of positron beam technology has been crucially dependent upon the discovery and design of efficient moderators to produce the low-energy (about 1 eV) positrons.