Electron impact excitation of the 33D state of helium has
been studied experimentally and theoretically using the
convergent close coupling (CCC) and R-matrix with pseudo-states
(RMPS) methods. Experimental and theoretical CCC emission
cross sections and polarizations of the 33D→23P line are reported. Theoretical cross sections for direct
excitation of the 33D state and polarizations of
corresponding emitted radiation are also reported using both CCC
and RMPS methods. Particular attention has been given to making
realistic estimates of the large cascade contributions to both
the cross sections and the polarization fraction of the
33D→23P radiation, using the CCC approach.
The self-consistency of the experimental and theoretical
polarization data gives confidence in their quality. On the
other hand differences remain between experimental and
theoretical emission cross sections at higher energies.
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