Electron-Photon Coincidences and Polarization of Impact Radiation
Two basic aspects are associated with the title of this talk: first, the physics of electron atom collisions in general, and secondly, as a special problem the angular distribution of photons and also their correlation with the angular distribution of electrons having excited atoms and from which photons are emitted. The collision process between unidirectional and monoenergetic electrons and atomic targets still represents an important chapter in our knowledge of fundamental scattering processes. Due to the recent success of new types of experiments which are different in their methods to conventional cross section measurements, the state of investigation of electron atom collision physics has changed considerably. On the one hand the situation can be characterised by the same remark as in Professor Bederson’s1 review paper on “Electronic Polarization Behaviour in Collisions” at the Third International Atomic Physics Conference in Boulder, namely, the subject of my report is part of the full story about the physics of electron atom collisions. On the other hand, the recent more ambitious and new types of experiments including electron spin and photon polarization analysis, and also the electron photon correlation measurements bring us to a much deeper understanding of the details of the electron atom collision process.
KeywordsPolarization Curve Excitation Function Born Approximation Excitation Cross Section Impact Radiation
Unable to display preview. Download preview PDF.
- 1).B. Bederson, in Atomic Physics 3, Proceedings of 3rd Int. Conf. on Atomic Physics, S.J. Smith and G.K. Walters, eds., Plenum Press, New York, 1973, p. 401.Google Scholar
- 2).Recent reviews in this field were given by B. Bederson, reference (1) of this article, also P.S. Farago, Reports on Progress in Physics, Vol. 34, No. 11, p.1055, 1971, and H. Kleinpoppen, Introductory Paper of Panel Discussion on Spin and Polarization Effects in Atomic Processes in “Fundamental Interactions in Physics”, edited by B. Kursunoglu, A. Perlmutter et al., Plenum Press 1973.Google Scholar
- 3) a).
- (d).P.S. Farago, J. Phys. B, Vol. 7, No. 1, p. 128Google Scholar
- i) J.H. Macek and I.V. Hertel, to be publishedGoogle Scholar
- 10).H. Hafner, H. Kleinpoppen and H. Krüger, Phys. Lett. 18, 270, 1965 and also H. Hafner and H. Kleinpoppen, Z. Physik, 198, 315, 1967.Google Scholar
- 17).G. Gould, Ph.D. thesis, University of South Wales, 1970.Google Scholar
- 18).P.D. Burrow and J.A. Michejda, private communications, similar resonance structure was also observed in the angular dependence in low energy electron - mercury scattering by M. Düweke, N. Kirchner, E. Reichert and E. Staudt, J. Phys. B, 6, L208, 1973.Google Scholar
- 19).T.W. Ottley, Ph.D. thesis, University of Stirling, 1974.Google Scholar
- 26).D.H. Crandall, P.O. Taylor and G.H. Dunn, quoted in U. Fano and J.H. Macek, Revs. Mod. Phys. 45, No. 4, 553, 1973.Google Scholar
- 28).M. Eminyan, K.B. MacAdam, J. Slevin and H. Kleinpoppen, Phys. Rev. Lett. 31, 576, 1972 and also J. Phys. B, to be published 1974.Google Scholar
- 29).R.E. Bell, Alpha, Beta and Gamma Ray Spectroscopy edited by K. Siegbahn, Amsterdam, North Holland Vol. 2.Google Scholar
- 30).R.E. Imhof and F.H. Read, J. Phys. B, 4, 450, 1971 and Chem. Phys. Lett. 11, 326, 1971.Google Scholar
- 31).M.C. Standage, M. Eminyan, H. Kleinpoppen, K.B. MacAdam and J. Slevin, J. Phys. B, to be published.Google Scholar
- 32).D.H. Madison and W.N. Shelton, Phys. Rev. A7, 449, 1973.Google Scholar
- 33).C.J. Joachain and R. Vanderpoorten, private communication, 1974.Google Scholar
- 35).a) M.R.C. McDowell, L.A. Morgan and Valerie P. Myerscough, private communication; see also Invited Papers by M.R.C. McDowell and (b) by S. Geltman in Proceedings of the International Symposium on Electron and Photon Interactions with Atoms in Honor of Ugo Fano, Stirling, 16th — 19th July, 1974, to be published by Plenum Press 1975.Google Scholar