Abstract
A radio frequency discharged helium gas jet was used to generate intrinsic excitations in bulk superfluid 4He. The present experimental results and our previous estimates show that metastable triplet state He atoms and excimers cannot enter directly the liquid but rather concentrate on the liquid surface. High concentration of metastable species promotes reactions, which then lead to formation of He ions. Upon electron - ion recombination, population of highly excited atomic and diatomic excimer electronic states occurs. Effect of molecular hydrogen on quenching of the helium emissions is demonstrated. Excitations are efficiently transferred from He to H2.
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