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arXiv 0804.19862008-04-15physics.chem-phphysics.atom-ph

Evolution from a molecular Rydberg gas to an ultracold plasma in a seeded supersonic expansion of NO

J. P. Morrison, C. J. Rennick, J. S. Keller, E. R. Grant

备注：: 4 pages (two column) 3 figures; smaller figure files, corrected typos
DOI：: 10.1103/PhysRevLett.101.205005

英文摘要：

We report the spontaneous formation of a plasma from a gas of cold Rydberg molecules. Double-resonant laser excitation promotes nitric oxide, cooled to 1 K in a seeded supersonic molecular beam, to single Rydberg states extending as deep as 80 cm$^{-1}$ below the lowest ionization threshold. The density of excited molecules in the illuminated volume is as high as 1 x 10$^{13}$ cm$^{-3}$. This population evolves to produce prompt free electrons and a durable cold plasma of electrons and intact NO$^{+}$ ions.

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