He(3P3)States Excited in 1.5- and 3.0-keVHe+-H2Charge-Transfer Collisions

The linear polarization of 3889-Å radiation in coincidence with scattered neutral particles has been measured for 1.5- and 3.0-keV ${\mathrm{He}}^{+}$-${\mathrm{H}}_2$ collisions at selected scattering angles. At one scattering angle the measurements show a stronger polarization than is presently observed in ${\mathrm{He}}^{+}$-He at any scattering angle; this is surprising in view of the many final states available to the recoiling ${\mathrm{H}}_2^{+}$ ion.