Elastic, charge transfer and related transport cross sections
for collisions among isotopomers of hydrogen ions, atoms and molecules and
helium |
Introduction
Important notes and updates
Publications
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The data tables and interactive graphs made available here contain
theoretical differential and integral elastic and related transport
(momentum transfer and viscosity) cross sections for collisions among
various isotopic combinations of H+, H, H2,
and He. Also available are cross sections (differential and integral)
for charge transfer in the ion-atom systems and spin exchange in the
atom-atom systems. All data have been calculated for center-of-mass
energies between 0.1 and 100 eV. Details of the theoretical formulations
used for each class of system and a full description of the principle
behaviors of these cross sections and scaling relations among them are
given in a series of papers available here in
preprint form.
The principal reference also contains tabulations of numerical
coefficients for fits to the elastic differential cross sections and
to the various integral cross sections. Pending sufficient interest
from users, these fitting coefficients will also be made available
through this site. The most important warning when using
the symmetric ion-atom or atom-atom data is the choice of treating
the colliding particles as quantum mechanically indistinguishable
or classically distinguishable. The choice can lead to significant
differences in the defintions and numerical values of the cross
sections. A full description of these consequences is given in the
supporting papers.
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3/10/1999
- 1. All differential and total cross sections have been updated
with our newest results. For symmetric systems (H+ + H,
D+ + D and T+ + T), fully quantal results
are given for the range 0.1-10 eV CM collision energy and
semiclassical for 10-100 eV. For asymmetric systems, the
region 0.1-1 eV is covered by fully quantal results and 1-100 eV
by semiclassical results.
- 2. For symmetric systems, the two sets of calculations for the
integral cross sections are given as follows:
- a) The calculation with assumption of indistinguishability of
particles (IP) of the projectile and target nuclei and
- b) The calculation where this assumption is modified so that
the cross sections have the correct limit of classical distinguishability
of particles (DP) of the nuclei.
- 3. In each case, the differential cross sections are calculated with
the assumption of indistinguishability of the nuclei.
10/11/2000
Ion-atom data are updated with quantal data for differential and integral cross sections
for elastic scattering of
protons, deuterons and tritons on He(1s2) for the range
of 0.1-100 eV collision energies. These are in the
same format as the other elastic data.
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The results contained in this website formed the basis for a volume of
recommended elastic and transport related cross sections (reference 1),
and many details of the calculations, their physical interpretation,
and their inter-relationships are detailed in references 2-4.
- 1. "Elastic and related transport cross sections for collisions
among isotopomers of H+ + H, H+ + H2,
H+ + He, H + H, and H + H2," P.S. Krstic and
D.R. Schultz, Atomic and Plasma-Material Data for Fusion 8, 1
(1998). (Postscript file containing the
introduction, basic theoretical description, comparison with existing
results, scaling relations, description of tables and graphs, and
references - approximately 70 pages, 1.68 Mb, approximately 650 pages
of graphs and tables omitted).
- 2. "Elastic scattering and charge transfer in slow collisions:
Isotopes of H and H+ colliding with isotopes of H and
with He," P.S. Krstic and D.R. Schultz, J. Phys. B 32, 3485
(1999).
- 3. "Consistent definitions for, and relationships among, cross
sections for elastic scattering of hydrogen ions, atoms, and molecules,"
P.S. Krstic and D.R. Schultz, Phys. Rev. A 60, 2118 (1999).
- 4. "Elastic and vibrationally inelastic slow collisions:
H + H2, H+ + H2," P.S. Krstic and
D.R. Schultz, J. Phys. B 32, 2415 (1999).
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