By H. Ehrhardt, J. Röder (auth.), Colm T. Whelan, H. R. J. Walters (eds.)
The nice benefit of accident measurements is that through appropriate number of the kinematical and geometrical association one could probe smooth actual results which might be swamped in much less differential experiments. The dimension of the triple dif ferential and higher-order move sections provides huge, immense technical problems, yet subtle experiments of this kind supply an perception into the subtleties of the scattering technique and provide a welcome, if critical, try out of the on hand theoretical versions. the previous few years were a thrilling time to paintings within the box and masses has been realized. Profound insights were gleaned into the elemental Coulomb few physique challenge in atomic physics: the experimental research of the elemental (e,2e) methods on hydrogen and helium goals keeps so as to add to our wisdom and certainly to problem the simplest of our theoretical versions; major advances were made within the realizing of the "double excitation problem," that's the examine of ionization procedures with lively goal electrons: very important measurements of (e,3e), (,),,2e), excitation-ionization and excitation autoionization were said and strides were made of their theoretical description; the longstanding discrepancies among idea and test for relativistic (e,2e) procedures have been resolved, spin established results anticipated and ob served and the 1st winning twist of fate experiments on surfaces and skinny movies have been introduced. thought and scan have complicated in shut consort. The papers pre sented right here disguise the full gambit of study within the box. a lot has been completed yet a lot continues to be done.
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Extra resources for Coincidence Studies of Electron and Photon Impact Ionization
For the experiments quoted above this has been achieved by measuring the He+(2s + 2p) cross section relative to the ground state He+(1s) cross section and then normalising the latter. In comparing our calculations for excitation - ionization with the experimental data we should therefore also monitor how theory and experiment agree for the corresponding He+(ls) cross section. While we shall restrict our comparisons to the above - mentioned coplanar asymmetric (e, 2e) experiments it should be noted that there are other measurements of excitation - ionization of helium in the literature.
OOL . O----::--:---=---::-:----~:----=' Figure 5. TDCS ( in units of 1O-22m2eV- 1sr- 2 ) for ionization to He+(ls) at Ef = 570 eV, E" = 10 eV and Of = 4° : solid curve, first Born approximation; dashed curve, second Born approximation; solid circles, experimental data of Stefani et aP9-21. experimental normalisation be in error? In figure 5 we show our calculations for n = 1 ionization in the same kinematics. We see very good agreement between the measurements and the second Born curve which accurately describes the reduction ( increase) of the binary ( recoil) peak and its rotation to larger ( smaller) 0" compared with the first Born approximation.
Phys. B, to be published. 3. J. T. J. Walters, Second - order effects in (e, 2e) excitation - autoionization of helium, J. Phys. B, to be published. 4. R. McGuire, Multiple - electron excitation, ionization, and transfer in high - velocity atomic and molecular collisions, Adv. At. Mol. Phys. 29:217 (1991). 5. J. Tweed, Double processes in e- - He collisions, Z. Phys. D 23:309 (1992). 6. A. L. Altick, Electron - impact ionization - excitation cross sections of helium, J. Phys. B 28:4639 (1995). 7.