Abstract

Strong fluorescence with high directionality was observed for the first time to our knowledge from the mercury atomic transition 73S1–63P0 at 404.7 nm by the photodissociation of HgBr2. Superfluorescence could be obtained only in a limited temperature region (130–160°C) when HgBr2 was excited by an ArF (193-nm) laser above a certain threshold power. Mechanisms for the formation of the excited mercury atom and for the quenching of the lower metastable state 63P0 are briefly discussed.

© 1982 Optical Society of America

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