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MO: Molekülphysik

MO 19: Cluster II

MO 19.1: Vortrag

Freitag, 26. März 2004, 11:00–11:15, HS 332

An Experimental Search for Ferromagnetic Supercooled o-H₂ Clusters — •Oleg Kornilov^1,2, Anton Kalinin^1,3, and J. Peter Toennies¹ — ¹Max-Planck-Institut für Strömungsforschung, Bunsenstr. 10, D-37073 Göttingen, Germany — ²Department of Physics, St. Petersburg State University, St. Petersburg, Russia — ³Institute of Energy Problems of Chemical Physics, Russian Academy of Sciences, Moscow, Russia

To achieve a macroscopically coherent superfluid state in supercooled hydrogen temperatures below 6.6 K have been predicted [1]. To avoid solidification below the triple point at 13.7 K hydrogen clusters formed in a free jet supersonic expansion provide No-dqidealNo-dq conditions owing to the lack of container walls and impurities, which could nucleate the solid. We are searching for the superfluidity of ortho-H₂ clusters based on their predicted ferromagnetic behavior [2]. A Rabi-type inhomogeneous magnetic field will be used to study spin states of moderate-size clusters formed in a cryogenic expansion of normal hydrogen. By seeding with helium the magnetic deflection will be increased and at the same time the hydrogen clusters will be cooled to about 0.37 K by evaporating of helium atoms from their surface.

[1] V.L. Ginzburg and A.A. Sobyanin, JETP Lett. 15, 242 (1972)

[2] G.M. Seidel, J. Hu, and H.J. Maris, Phys. Rev. Lett. 53, 1164 (1984)