Abstract
We report the first observation of bound free emission around 599.2 nm in single photon excitation of 39K 2 Rydberg states using 337.1 nm (N 2) laser radiation from an excimer laser. The broad continuum emission is tentatively assigned to the 2 1Σ + u→X 1Σ + g transition. The parametric dependences for the new band and the well-known yellow diffuse band (2 3Π g→a 3Σ + u), observed around 573.5 nm, have indicated that such emissions are induced by collision energy transfer from high lying Rydberg states. Energy and temperature dependences were also carried out for better understanding of the population mechanism of the upper states, responsible for such emissions.
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