The polarization of Balmer-α radiation excited in
collisions of electrons with atomic hydrogen is presented for an
electron energy range from threshold to 1000 eV. Measurements
are in good agreement with calculations carried out using
either convergent-close-coupling or R-matrix with
pseudo-states approaches. Cascade is demonstrated to
have a significant effect. Balmer-α excitation function
data are also presented. A previous measurement of the
polarization of Balmer-α following dissociative
excitation of H2 by electrons is
confirmed and extended.
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