Elsevier Science Home
Computer Physics Communications Program Library
Full text online from Science Direct
Programs in Physics & Physical Chemistry
CPC Home

[Licence| Download | New Version Template] aaoz_v1_0.gz(11 Kbytes)
Manuscript Title: A Monte Carlo calculation of the dissociation of fast H2+ ions traversing thin carbon foils.
Authors: W.D. Ruden, R.M. Schectman
Program title: CARLO
Catalogue identifier: AAOZ_v1_0
Distribution format: gz
Journal reference: Comput. Phys. Commun. 28(1983)355
Programming language: Fortran.
Computer: IBM 4341.
Operating system: CP/CMS.
RAM: 50K words
Word size: 8
Peripherals: disc.
Keywords: Monte Carlo, Molecular ions, Molecular dissociation, Coulomb explosion, Mutliple, Scattering, Elastic.
Classification: 16.7.

Nature of problem:
Calculation of the distributions of inter-particle separation and relative energy for protons which result from the dissociation of fast H2+ ions traversing thin carbon foils as a function of incident ion energy and target foil thickness. Effects of Coulomb explosion in a screened Coulomb field, multiple Coulomb scattering by target atoms, and differential energy loss (straggling) are included.

Solution method:
The problem is solved by application of Monte Carlo techniques in order to account for the simultaneous occurrence of the three processes described above.

Restrictions:
Foils must be sufficiently thin that the total change in the energies of the incident protons is not a significant fraction of the initial value and that the final interproton separation not be so large as to be comparable with the foil thickness. With the DIMENSION statements supplied, a maximum of 500 H2+ ions can be followed through a foil in one run.

Running time:
Depends upon the problem being treated. For example, provided, the number of foil slices, NS, is 545 and typical running times per event (one H2+ molecule followed through the foil) are: Coulomb explosion plus electronic straggling but no multiple scattering, 1.0 s; with multiple scattering added, 1.4 s.