By H. Ehrhardt, J. Röder (auth.), Colm T. Whelan, H. R. J. Walters (eds.)
The nice good thing about accident measurements is that by way of appropriate selection of the kinematical and geometrical association one may well probe soft actual results which might be swamped in much less differential experiments. The size of the triple dif ferential and higher-order move sections offers huge, immense technical problems, yet sophisticated experiments of this kind offer an perception into the subtleties of the scattering technique and supply a welcome, if serious, try of the to be had theoretical versions. the previous few years were an exhilarating time to paintings within the box and masses has been realized. Profound insights were gleaned into the fundamental Coulomb few physique challenge in atomic physics: the experimental research of the elemental (e,2e) methods on hydrogen and helium pursuits keeps so as to add to our wisdom and certainly to problem the easiest of our theoretical types; major advances were made within the figuring out of the "double excitation problem," that's the research of ionization approaches with energetic objective electrons: very important measurements of (e,3e), (,),,2e), excitation-ionization and excitation autoionization were pronounced and strides were made of their theoretical description; the longstanding discrepancies among idea and test for relativistic (e,2e) methods have been resolved, spin established results anticipated and ob served and the 1st winning accident experiments on surfaces and skinny motion pictures have been introduced. thought and scan have complicated in shut consort. The papers pre sented the following conceal the entire gambit of study within the box. a lot has been accomplished yet a lot continues to be done.
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Extra resources for Coincidence Studies of Electron and Photon Impact Ionization
13. H. Ehrhardt, M. Fischer, K. W. J. Joachain and B. Piraux, Triple differential cross sections for the ionization of helium by fast electrons, Phys. Rev. Lett. 48:1807 (1982). 14. F. J. Tweed and J. Langlois, The effect of target atom polarization and wavefunction distortion in (e-2e) ionization of hydrogen, J. Phys. B: At. Mol. Phys. 29:1767 (1996). 15. C. A. P. Myerscough, Electron impact excitation of Hand He+ I. Is -+ ns transitions, J. Phys. B: At. Mol. Phys. 6:1435 (1973). 16. J. Tweed and J.
Chant, Distortion effects in the (e, 2e) spectroscopy of helium at high momentum, J. Phys. B 19:969 (1986). 25. E. McCarthy, A. Ugbade, E. O. Teubner, (e, 2e) reaction as a probe for details ofthe helium wave function, Phys. Rev. Lett. 33:459 (1974). 26. J. H. Read, Coplanar doubly - symmetric helium (e, 2e) measurements with excitation of the residual ion, J. Phys. B 25:L579 (1992). 27. L. Forand, K. W. McConkey, Absolute electron impact emission cross section of the He+ 22 p -+ 12 S line at 304 A produced by simultaneous ionisation excitation, J.
Ehrhardt, Triply differential cross sections for ionization of hydrogen atoms by electrons: the intermediate and threshold energy regions, J. Phys. B: At. Mol. Phys. 24:657 (1991). 20. J. Tweed, C. Tannous and P. Marchalant, Modelling of three-body effects in a double continuum, Journal de Physique 107:3 (1993). 21. M. J. Tweed and O. Robaux, Semiclassical approach to PCI in (e-2e) ionization of H: coplanar geometry energy sharing, J. Phys. B: At. Mol. Phys. 29:791 (1996). 20 EXCITATION - IONIZATION AND EXCITATION - AUTOIONIZATION OF HELIUM Pascale J.