Journal ArticleDOI
Computation of Elastic Scattering Phase Shifts via Analytic Continuation of Fredholm Determinants Constructed Using an L 2 Basis
TLDR
In this article, it was shown that the Fredholm determinant for the Lippmann-Schwinger equation can be computed for complex energies using only ${L}^{2}$ basis functions, showing that it is not necessary to explicitly enforce asymptotic boundary conditions for numerical scattering computations.Abstract:
It is shown that the Fredholm determinant for the Lippmann-Schwinger equation may be computed for complex energies using only ${L}^{2}$ basis functions. Analytic continuation to the real axis in the $E+i\ensuremath{\epsilon}$ limit gives elastic scattering phase shifts over a continuous range of energies, showing that it is not necessary to explicitly enforce asymptotic boundary conditions for numerical scattering computations, and suggesting that elastic electron-atom or -ion scattering information may be obtained using standard bound-state configuration-interaction methods.read more
Citations
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Journal ArticleDOI
The theory of electron-molecule collisions
TL;DR: The current state of the theory and its application to low-energy electron-molecule collisions is reviewed in this paper, where the emphasis is on elastic scattering and vibrational and rotational excitation of small diatomic and polyatomic molecules.
Book ChapterDOI
The R-Matrix Theory of Atomic Processes
Philip G. Burke,W. D. Robb +1 more
TL;DR: The R-matrix concept of atomic processes was first introduced by Wigner and Eisenbud as mentioned in this paper with the fundamental idea that configuration space describes the scattered particle, and the target is divided into two regions.
Journal ArticleDOI
On an “equivalent quadrature” calculation of matrix elements of (z − p2/2m)−1 using an L2 expansion technique
TL;DR: In this paper, the problem of interpreting the L 2 discretization of an operator with a continuous spectrum is partially solved for the s -wave kinetic energy, H 0. But it is not shown that the matrix elements of the resolvent operator (z − H 0 ) −1, where H 0 is a matrix representation of H 0 in an L 2 basis, can be interpreted as quadrature approximations to the actual spectral representation of the Resolvent, allowing the z → E + iϵ limit to be taken for E in the continuous spectrum of H
Journal ArticleDOI
L2 series solution of the relativistic Dirac–Morse problem for all energies
TL;DR: In this paper, the authors obtained analytic solutions for the one-dimensional Dirac equation with the Morse potential as an infinite series of square integrable functions for all energies, the discrete as well as the continuous.
Book ChapterDOI
New L 2 approach to quantum scattering: Theory
Eric J. Heller,Hashim A. Yamani +1 more
TL;DR: In this paper, the authors exploit the soluble infinite tridiagonal (Jacobi)-matrix problem generated by evaluating a zero-order scattering Hamiltonian H0 in a certain L 2 basis set, and obtain phase shift, wave functions, etc.
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