title: "Eclipse" effect in the scattering of weakly bound helium clusters.
abstract: The total cross sections of the helium dimer, trimer, and tetramer for scattering from Kr atoms have been measured for cluster beam velocities between 250 and 820 m/s. The dimer cross section is twice that of the atom within 5% indicating that the Kr atoms scatter from the He atoms independently, which is consistent with the large dimer bond distance of about 50 A. The trimer and tetramer cross sections are somewhat larger and can be described by an impulse approximation with a multiple "eclipse" correction, extending ideas of Glauber for high energy collisions with the deuteron.
authors.affiliation: Max-Planck-Institut für Strömungsforschung, Göttingen, Germany.
authors.forename: Anton
authors.initials: A
authors.lastname: Kalinin
authors.forename: Oleg
authors.initials: O
authors.lastname: Kornilov
authors.forename: Lev
authors.initials: L
authors.lastname: Rusin
authors.forename: J Peter
authors.initials: JP
authors.lastname: Toennies
authors.forename: George
authors.initials: G
authors.lastname: Vladimirov