INVESTIGADORES
MITNIK Dario Marcelo
artículos
Título:
An R-matrix with pseudo-states calculation of electron-impact excitation in C2+
Autor/es:
MITNIK, D. M.; GRIFFIN, D. C.; BALLANCE, C. P.; BADNELL, N. R.
Revista:
JOURNAL OF PHYSICS B-ATOMIC MOLECULAR AND OPTICAL PHYSICS
Editorial:
IOP
Referencias:
Lugar: Bristol, London; Año: 2003 vol. 36 p. 717 - 730
ISSN:
0953-4075
Resumen:
We have performed an R-matrix with pseudo-states (RMPS) calculation of
electron-impact excitation in C2+. Collision strengths and
effective collision strengths were determined for excitation between the
lowest 24 terms, including all those arising from the 2s3l and 2s4l
configurations. In the RMPS calculation, 238 terms (90 spectroscopic and
148 pseudo-state) were employed in the close-coupling (CC) expansion of
the target. In order to investigate the significance of coupling to the
target continuum and highly excited bound states, we compare the RMPS
results with those from an R-matrix calculation that incorporated all
238 terms in the configuration-interaction expansion, but only the
lowest 44 spectroscopic terms in the CC expansion. We also compare our
effective collision strengths with those from an earlier 12-state
R-matrix calculation (Berrington
et al 1989 J. Phys. B: At. Mol. Opt. Phys. 22 665). The RMPS
calculation was extremely large, involving (N + 1)-electron Hamiltonian
matrices of dimension up to 36 085, and required the use of our recently
completed suite of parallel R-matrix programs. The full set of effective
collision strengths from our RMPS calculation is available at the Oak
Ridge National Laboratory Controlled Fusion Atomic Data Center web
site.