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Observation of elastic scattering effects on photoelectron angular distributions in free Xe clusters

G Öhrwall1, M Tchaplyguine1,2, M Gisselbrecht2, M Lundwall1, R Feifel1, T Rander1, J Schulz2, R R T Marinho3,4, A Lindgren5, S L Sorensen5, S Svensson1 and O Björneholm1

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We report an observation of substantial deviations in the photoelectron angular distribution for photoionization of atoms in free Xe clusters compared to the case of photoionization of free atoms. The cross section, however, seems not to vary between the cluster and free atoms. This observation was made in the vicinity of the Xe 4d Cooper minimum, where the atomic angular distribution is known to vary dramatically. The angular distribution of electrons emitted from atoms in the clusters is more isotropic than that of free atoms over the entire kinetic energy range studied. Furthermore, the angular distribution is more isotropic for atoms in the interior of the clusters than for atoms at the surface. We attribute this deviation to elastic scattering of the outgoing photoelectrons. We have investigated two average cluster sizes, \langle N\rangle \approx 4000 and 1000 and found no significant differences between these two cases.


PACS

32.80.Fb Photoionization of atoms and ions

34.35.+a Interactions of atoms and molecules with surfaces

36.40.Mr Spectroscopy and geometrical structure of clusters

Subjects

Atomic and molecular physics

Dates

Issue 19 (14 October 2003)

Received 21 May 2003

Published 12 September 2003



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