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

2009/04/15 by Jingwei Guo, Mervash Varnasseri, Guo, Jingwei +6
Engineering · Medicine · Physics and Astronomy · #Dust and Plasma Wave Phenomena #FOS: Physical sciences #Laser-induced spectroscopy and plasma #Plasma Applications and Diagnostics #Quantum Gases (cond-mat.quant-gas) #cond-mat.quant-gas

paper · pdf · doi:10.48550/arxiv.0904.2275

openalex publication_date 2009/04/15 · arxiv created 2010/04/03 · arxiv updated 2010/04/06 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

Abstract

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

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