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4 pages, 4 figures.-- PACS nrs.: 36.40.–c, 33.20.Fb, 61.46.+w.Small para-H2 clusters (pH2)N with N=2,...,8 have been identified by Raman spectroscopy in cryogenic free jets of the pure gas, near the Q(0) Raman line of the H2 monomer. The high resolution in space, time, and number size makes it possible to follow their growth kinetics with distance from the orifice. At lower source temperatures liquid clusters appear early in the expansion and then undergo a gradual phase transition to the solid state. The technique is very promising for exploring superfluidity in pure (pH2)N clustersThis work was supported by the Spanish DGI (MCyT), research project No. BFM2001-2265. D. B. acknowledges support from the Petroleum Research Fund and the NSF.Peer reviewe

physical review letters

Raman Spectroscopy of Small Para-<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi mathvariant="normal">H</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>Clusters Formed in Cryogenic Free Jets

Raman Spectroscopy of Small Para-H2Clusters Formed in Cryogenic Free Jets