Abstract
An experimental investigation has been made of the scattering of metastable hydrogen formed in collisions of neutral hydrogen with helium; projectile energies were in the range 1 to 20 keV and scattering angles investigated range from 0.2\ifmmode^\circ\else\textdegree\fi{} to 1.5\ifmmode^\circ\else\textdegree\fi{}. In addition angular distributions of scattering H${}^{0}$ and ${\mathrm{H}}^{+}$ were measured in an extended angular range of 0.2\ifmmode^\circ\else\textdegree\fi{} - 5.0\ifmmode^\circ\else\textdegree\fi{}. Total cross sections for $\mathrm{H}(2s)$ formation in helium and argon targets have also been measured. The total cross sections for $\mathrm{H}(2s)$ formation in helium are in good agreement with coupled-state theoretical predictions at energies above 4.0 keV; the measured differential cross sections show the same angular dependence as theory at 10-keV impact energy. Also, at low energies, a low-angle peak is found in the angular distribution of $\mathrm{H}(2s)$; this is in accordance with theoretical predictions.
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