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Manuscript Title: A program for computing autoionization properties.
Authors: C.F. Fischer, T. Brage
Program title: MCHF_AUTO
Catalogue identifier: ACLD_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 74(1993)381
Programming language: Fortran.
Computer: VAX 11/780.
Operating system: VMS, Sun UNIX.
RAM: 514K words
Word size: 32
Peripherals: disc.
Keywords: Atomic physics, Structure, Autoionization, Line widths, Dielectronic Recombination, Electron emission, Resonances, Complex atoms, Functions wave, Continuum processes.
Classification: 2.1.

Subprograms used:
Cat Id Title Reference
ABZU_v1_0 MCHF_LIBRARIES CPC 64(1991)399
ABZV_v1_0 MCHF_GENCL CPC 64(1991)406
ABZW_v1_0 MCHF_NONH CPC 64(1991)417
ABZX_v1_0 MCHF_88 CPC 64(1991)431
ABZY_v1_0 MCHF_BREIT CPC 64(1991)455
ABZZ_v1_0 MCHF_CI CPC 64(1991)473
ACBA_v1_0 MCHF_MLTPOL CPC 64(1991)486

Nature of problem:
This program is an extension of the MCHF atomic structure package to calculations of autoionization rates and line widths.

Solution method:
Given a configuration list, radial functions and energies for one or more discrete states, in an LS or LSJ scheme, the program solves the Hartree-Fock equation for a continuum orbital. This is used to calculate the interaction element between the discrete state and the open channel. From this a number of different autoionization properties can be obtained by using the "Golden Rule" (U.Fano, Phys. Rev. 124(1961) 1866).

The dimensions of the atomic structure package restrict the number of configuration states to 100, but this can readily be changed. Only one continuum orbital is allowed.

Unusual features:
Some non-orthogonalities are allowed (C.F. Fischer, Comp. Phys. Commun 64(1991)369). Exchange interaction within the core can be included.

Running time:
The CPU time required for the test run is 1.1 seconds for the first case and 29.1 seconds for the second on a SUN SPARC-station 330.