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Coherent electron impact excitation of the n=2 states of atomic hydrogen at intermediate energies

par Potvliege, Robert ;Joachain, Charles
Référence Journal of Physics B: Atomic and Molecular Physics, 18, 16, page (L585-L588), 009
Publication Publié, 1985

Article révisé par les pairs

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Résumé :

A theoretical analysis is given of the parameters M1+M 3, M2 and cos delta which describe the coherent excitation of the n=2 states of atomic hydrogen by intermediate-energy electrons. At small momentum transfers, where they have recently been measured by Back et al. (1984), the parameters M1+M3 and M2 are dominated by first Born s-p amplitudes, but outside the small-angle region higher-order effects are shown to be very important. The parameter cos delta is also very sensitive to higher-order effects. Unitarised eikonal-Born series (UEBS) results are presented for M1+M3, M2 and cos delta at incident electron energies of 100, 300 and 350 eV.