ABSTRACT
IAEA-F4-TM-42581
IAEA Technical Meeting on Atomic, Molecular and Plasma Material Interaction Data for
Fusion Science and Technology
DISSOCIATIVE PROCESSES OF ELECTRON SCATTERING
FROM THE MOLECULAR HYDROGEN ION AND ITS
ISOTOPOLOGUES
D. V. Fursa, M. C. Zammit, I. Bray
Curtin University, Perth, Australia
E-mail address of main author: d.fursa@curtin.edu.au
Electron collisions with the molecular hydrogen ion H2+ and it isotopologues (D2+, T2+, HD+,
HT+ and DT+) play an important role in determining the dynamics of fusion, astrophysical
and laboratory produced low-temperature hydrogen plasmas. Experimentally H2+ is produced
by electron-impact ionization of H2. This can leave H2+ in one of its 20 bound vibrational
states and many experimental measurements are taken with H2+ populated in a range of
vibrational states.
Here we report the progress of implementing the adiabatic convergent-close-coupling (CCC)
method in its application to electron scattering from vibrationally excited H2+ and its
isotopologues. The present adiabatic CCC results are used to obtain electron scattering cross
sections that are resolved for vibrationally excited states of H2+ and its isotopologues.
Adiabatic cross sections were weighted according to vibrational population of the molecule
and comparison with experiment is excellent across the energy range from near threshold to
1 keV. Account of the vibrational distribution of H2+ was found to be very important [1].
In the figure we present
proton production cross
sections calculated in the
351-state adiabatic CCC
model. Cross sections for
scattering from vibrationally
excited states were weighted
according to the FrankCondon (FC) distribution.
These results are compared
with the present fixed-nuclei
calculations at R = 2.0 a0 and
measurements of Peart and
Dolder [2] Dunn and Van
Zyl [3] and Dance et al. [4]
[1] M. C. Zammit, D. V. Fursa, and I. Bray, Phys. Rev. A 90, 022711 (2014).
[2] B. Peart and K. T. Dolder, J. Phys. B 4, 1496 (1971).
[3] G. H. Dunn and B. Van Zyl, Phys. Rev. 154, 40 (1967).
[4] D. F. Dance etal., Proc. Phys. Soc. 92, 577 (1967)
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