C P Ballance and D C Griffin 2004 J. Phys. B: At. Mol. Opt. Phys. 37 2943 doi:10.1088/0953-4075/37/14/008
C P Ballance and D C Griffin
Show affiliationsA number of convergent close-coupling and R-matrix with pseudo-state (RMPS) calculations for H-like, He-like, Li-like and Be-like ions have demonstrated that coupling to the target continuum can have large effects on the electron-impact excitation cross sections of neutral and low-charge species. However, no one has yet attempted such advanced calculations on a system as complex as neutral neon. We report on a series of RMPS calculations of electron-impact excitation of Ne using recently developed parallel Breit–Pauli R-matrix programs. Our largest calculation included 235 spectroscopic and pseudo-state levels in the close-coupling expansion of the target. Although the results clearly reveal the importance of coupling to the target continuum in this atom, the pseudo-state expansion is not yet sufficiently complete to provide reliable cross sections for energies above the ionization limit. However, this is the largest intermediate-coupling calculation that can be performed with present computer resources. Thus, we have also carried out a series of RMPS calculations in LS coupling with different pseudo-state expansions. Comparisons of these results have allowed us to determine the approximate size of the pseudo-state expansion required to achieve convergence in future intermediate-coupling calculations for neon.
34.80.Dp Atomic excitation and ionization
31.15.bt Statistical model calculations (including Thomas–Fermi and Thomas–Fermi–Dirac models)
Issue 14 (28 July 2004)
Received 30 April 2004
Published 8 July 2004
C P Ballance and D C Griffin 2004 J. Phys. B: At. Mol. Opt. Phys. 37 2943
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