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An ultra-cold molecular plasma with extraordinarily long lifetime (~0.5 ms)is generated under strong collisional cooling conditions in the expansionregion of a seeded supersonic jet expansion close to the nozzle. A resonanttwo-photon one-color laser process excites para-difluorobenzene molecules intothe high-n Rydberg threshold region. Disorder heating during plasma formationis quenched by the high collision rate in the expansion, which keeps the ionsat the translational jet temperature of 0.2K-0.7K. The Coulomb couplingparameter \Gammai for the ions is expected to be ca. 230-820.

An ultra-cold, molecular Rydberg plasma with exceptionally long lifetime  and strongly-coupled properties formed by threshold laser excitation in the  expansion region of a supersonic jet