Selective Enhancement in Hydrogenlike Molecules with the Rare Gases. I. H2 with Ar and Kr

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Abstract
The early work of Lyman on selective enhancement of the H2 spectrum in the vacuum‐uv region when excited with Ar is studied further and extended to include some additional evidence with Kr as well as with Ar. The earlier interpretations are modified, and resonance fluorescence is seen to offer a generally satisfactory explanation, but here collisions of the second kind also offer a possible explanation as well. At the same time, it should be remarked that rather little evidence for such collisions involving metastables was observed in this work, as contrasted with collisions involving allowed levels. A rotation‐forbidden process, thus necessarily collisional, can be advanced in a few of the observed cases.