Berlin 2005 – scientific programme

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Q: Quantenoptik und Photonik

Q 10: Ultrakalte Moleküe

Q 10.4: Talk

Saturday, March 5, 2005, 09:45–10:00, HU Kinosaal

Investigation of Mixed ⁴He_m³He_n Clusters by Matter Wave Diffraction — •Oleg Kornilov¹, Anton Kalinin¹, Wieland Schöllkopf^1,2, and J. Peter Toennies¹ — ¹Max-Planck-Institut für Strömungsforschung, Bunsenstr. 10, 37073 Göttingen, Germany — ²Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany

Mixed isotope helium clusters are very weakly bound objects, whose properties depend on the quantum statistics and masses of the constituents. These small clusters exhibit a number of magic stabilities resulting from spin pairing effects in the ³He constituents. Molecular beams of ⁴He_m³He_n clusters have been analyzed using the matter-wave diffraction technique. Clusters with (m,n) = (2,1), (2,2), (3,1), (3,2), (4,1), (4,2), (4,3), (5,1), (5,2), (6,1) could be identified experimentally for the first time and provide a confirmation for their predicted stabilities [1,2]. The clusters are also being investigated using deflection in a strong inhomogeneous magnetic field.

[1] D. Bressanini and G. Morosi, Few-Body Systems 34, 131 (2004).

[2] R. Guardiola and J. Navarro, Phys. Rev. A 68, 055201 (2003).