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APS » Journals » Phys. Rev. Lett. » Volume 92 » Issue 22
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Phys. Rev. Lett. 92, 223401 (2004) [4 pages]

Raman Spectroscopy of Small Para-H2 Clusters Formed in Cryogenic Free Jets

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G. Tejeda1, J. M. Fernández1, S. Montero1, D. Blume2, and J. P. Toennies3
1Instituto de Estructura de la Materia, CSIC, Serrano 121, E-28006 Madrid, Spain
2Department of Physics, Washington State University, Pullman, Washington 99164-2814, USA
3Max-Planck-Institut für Strömungsforschung, Bunsenstraße 10, D-37073 Göttingen, Germany

Received 11 February 2004; published 2 June 2004

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 clusters.

© 2004 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevLett.92.223401
DOI:
10.1103/PhysRevLett.92.223401
PACS:
36.40.–c, 33.20.Fb, 61.46.+w
 
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