Computer Physics Communications Program LibraryPrograms in Physics & Physical Chemistry |

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Manuscript Title: A program for calculating relativistic elastic electron-atom
collision data. | ||

Authors: A.C. Yates | ||

Program title: A SCAT | ||

Catalogue identifier: ACQX_v1_0Distribution format: gz | ||

Journal reference: Comput. Phys. Commun. 2(1971)175 | ||

Programming language: Fortran. | ||

Computer: CDC 6600. | ||

Operating system: SCOPE 3.3. | ||

RAM: 20K words | ||

Word size: 60 | ||

Keywords: Atomic physics, Scattering, Electrons, Relativistic, Partial-waves, Spin-polarization, Numerov. | ||

Classification: 2.4. | ||

Nature of problem:The program calculates angular distributions (differential cross sections) and spin-polarization distributions of electrons scattered elastically by atomic targets within the framework of the static field approximation, by solving the radial Dirac equations. | ||

Solution method:The radial Dirac equations are cast into Schrodinger form, and the resulting second-order differential equation is solved by using tehe modified form of the Numerov algorithm. The partial-wave series are then summed directly. | ||

Restrictions:As written, the program handles any scalar potential written as a sum of Yukawa terms, but is easily modified to treat other functional forms, or numerical tables. | ||

Running time:The test run for Z=7, at 500 ev requireds 25 partial waves run takes 17 s to execute on the CDC 6600. |

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