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.

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.