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By Harald Friedrich (auth.)

ISBN-10: 3642382819

ISBN-13: 9783642382819

ISBN-10: 3642382827

ISBN-13: 9783642382826

This publication offers a concise and sleek assurance of scattering concept. it truly is influenced by means of the truth that experimental advances have shifted and broadened the scope of functions the place ideas from scattering thought are used, e.g. to the sector of ultracold atoms and molecules, which has been experiencing huge, immense progress in recent times, mostly caused by way of the profitable attention of Bose-Einstein condensates of dilute atomic gases in 1995.

In the current therapy, specific realization is given to the position performed by way of the long-range behaviour of the projectile-target interplay, and a concept is built, that's like minded to explain near-threshold certain and continuum states in life like binary platforms resembling diatomic molecules or molecular ions.

The point of abstraction is saved as little as in any respect attainable, and deeper questions concerning mathematical foundations of scattering idea are glided by. The e-book may be comprehensible for somebody with a uncomplicated wisdom of nonrelativistic quantum mechanics. it really is meant for complex scholars and researchers, and it truly is was hoping that it'll be important for theorists and experimentalists alike.

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The wave function is assumed to obey the timeindependent Schrödinger equation for a particle with (reduced) mass μ in the potential V (r), − 2 2μ Δ + V (r) ψ(r) = Eψ(r). 1), which at large distances obey boundary conditions corresponding to an incoming plane wave and an outgoing, scattered spherical wave, as sketched in Fig. 1, r→∞ ψ(r) ∼ eikz + f (θ, φ) eikr . 2) Although a real scattering event is a time-dependent process, the description via stationary solutions of the time-independent Schrödinger equation is adequate in most experimental situations [30].

111) can be vanishes rapidly away from k. changed to −∞ and, in the small range of k-values filtered out by φ(k), we can 50 2 Elastic Scattering by a Conservative Potential approximate ω(k) by its first-order Taylor expansion, ¯ ω(k) ≈ ω¯ + υ(k ¯ − k), ¯ υ¯ = ω¯ = ω(k), dω k¯ = . 113) where we have changed the integration variable from k to k − k¯ and replaced φ(k) ¯ which is peaked around argument zero. 113) is essentially the Fourier transform of φ˜ and is a function of the conjugate variable r + υt, ¯ ¯ ¯ Ψ (r + υt).

33). They are called scattering phase shifts, because they determine the scattering amplitude, as shown in the following. 43) l=0 where the jl are the spherical Bessel functions of the first kind, already introduced in Eq. 38). 2). The scattering amplitude f depends only on the polar angle θ , because the whole wave function does not depend on the azimuthal angle φ. 44) fl Pl (cos θ ), l=0 with constant coefficients fl , the partial-wave scattering amplitudes. 33) gives an explicit expression for the asymptotic behaviour of the radial wave functions, 2l + 1 π sin kr − l k 2 r→∞ ul (r) ∼ il + fl ei(kr−lπ/2) 2l + 1 π + ifl sin kr − l k 2 = il + fl cos kr − l π 2 .

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Scattering Theory by Harald Friedrich (auth.)


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