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Experiments on small (H2)N clusters

AutorMontero, Salvador ; Hernández Morilla, Juan ; Tejeda, Guzmán ; Fernández Sánchez, José María
Palabras clave[PACS] Atomic and molecular clusters
[PACS] Raman and Rayleigh spectra
[PACS] Boson systems
Fecha de publicación6-feb-2009
CitaciónEuropean Physical Journal D - Atomic, Molecular, Optical and Plasma Physics 52: 31-34 (2009)
ResumenThe nucleation process of small hydrogen clusters has been studied in detail with space, time, and number size resolution on the basis of supersonic expansions of the gas through a cryogenic nozzle operating in the thermal range 24 < T < 110 K. The diagnostic of the jet medium is based on high sensitivity (few photons/sec) Raman spectroscopy with very high spatial resolution (~ 2 μm), enabling for quantitative measurements with time resolution in the domain of nanoseconds. Temperatures down to 0.1 K have been attained in the jet at a collisional rate low enough to avoid sudden freezing of the gas. Clusters between two and eight molecular units are observed size-resolved. Features of the ortho-ortho and ortho-para hydrogen dimers, and the role of three-body collisions for nascent dimers and trimers are reported.
Descripción4 pages, 4 figures, 1 table.-- PACS nrs.: 36.40.-c, 33.20.Fb, 05.30.Jp.
Contributed to: ISSPIC'14 - 14th International Symposium on Small Particles and Inorganic Cluster (Valladolid, Sep 15-19, 2008).
Versión del editorhttp://dx.doi.org/10.1140/epjd/e2009-00031-y
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