Triply differential (e,2e) cross sections for He from threshold to 50 eV above
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چکیده
Distorted wave calculations of the triply differential cross sections for electron-impact ionization of He are presented for electrons sharing < 50 eV excess energy (Ex) and having the coplanar, 012 = n geometry. The results are in good agreement with absolute experimental measurements of T. Rosel et al. [Phys. Rev. A 46 (1992) 2539-25521 and of A. J. Murray, M. B. Woolf, and F. H. Read [J. Phys. B 25 (1992) 3021-30361. For final state electrons sharing 2 eV excess energy equally, many-body perturbation theory corrections to the authors' first order (e,2e) triply differential cross sections [Phys. Rev. A 45 (1992) 458846031 are also presented. These results indicate that singlet-triplet interchannel coupling effects in the final state are very significant; that initial state correlations are significant near the perpendicular plane, i.e., O1 = O2 = nI2; and that the polarization effects we include are insignificant. Finally, comparison of our first order results with the semiclassical quanta1 theory results of D. S. F. Crothers [J. Phys. B 19 (1986) 4634831 shows excellent agreement for excess energies Ex 2 2 eV and for O1 = O2 = n/2; for Ex < 2 eV, the two results diverge as Ex 4 0, indicating that experimental tests of the Wannier-PeterkopRau theory of three-body Coulomb breakup should be carried out in this energy region.
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تاریخ انتشار 2016