A Study of the Beam-Foil Excitation Mechanism Using 30-300 keV He+Projectiles

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Abstract
Beam-foil excitation functions have been measured for some optical transitions in neutral He (singly as well as doubly excited) and ionized He in the projectile energy range 30-300 keV. The excitation functions have been converted into relative population functions, which for levels within individual level schemes are proportional. The three sets of population functions have been linked by two parameters, one accounting for Rydberg states, and the other accounting for 1s core vacancies. The two empirically determined parameters reproduce also charge state distribution data as well as an absolute beam-foil population measurement.The relative level populations have been measured for thend3DRydberg series,n⩽ 11, at 100 keV and at 200 keV and found to be asymptotically close to ann-3behaviour.A search for optical observation of radiative electron capture was performed at 100 keV and 200 keV, the result being negative.