small-angle scattering and quasiclassical approximation beyond leading order
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ID: 248487
2015
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Abstract
In the present paper we examine the accuracy of the quasiclassical approach on the example of small-angle electron elastic scattering. Using the quasiclassical approach, we derive the differential cross section and the Sherman function for arbitrary localized potential at high energy. These results are exact in the atomic charge number and correspond to the leading and the next-to-leading high-energy small-angle asymptotics for the scattering amplitude. Using the small-angle expansion of the exact amplitude of electron elastic scattering in the Coulomb field, we derive the cross section and the Sherman function with a relative accuracy θ2 and θ1, respectively (θ is the scattering angle). We show that the correction of relative order θ2 to the cross section, as well as that of relative order θ1 to the Sherman function, originates not only from the contribution of large angular momenta l≫1, but also from that of l∼1. This means that, in general, it is not possible to go beyond the accuracy of the next-to-leading quasiclassical approximation without taking into account the non-quasiclassical terms.
| Reference Key |
krachkov2015physicssmall-angle
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|---|---|
| Authors | ;P.A. Krachkov;R.N. Lee;A.I. Milstein |
| Journal | ACS chemical biology |
| Year | 2015 |
| DOI |
10.1016/j.physletb.2015.10.049
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