J. P. Toennies
Max Planck Society
347 Papers
4.2K Citations
J. P. Toennies is an academic researcher from Max Planck Society. The author has contributed to research in topics: Scattering & Helium atom scattering. The author has an hindex of 58, co-authored 342 publications. Previous affiliations of J. P. Toennies include University of Bonn.
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Papers
Excitation and ionization of 4He clusters by electrons
TL;DR: In this paper, the neutral beam time-of-flight distribution has three peaks associated with distinct groups of large and small clusters, and atoms, and the dependence of the various charged and neutral metastable fragment currents on the bombarding electron energy reveals that each has a unique appearance potential.
Combined He-atom scattering and theoretical study of the low energy vibrations of physisorbed monolayers of Xe on Cu(111) and Cu(001)
Antonio Šiber,Branko Gumhalter,J. Braun,A. P. Graham,Massimo F. Bertino,J. P. Toennies,D. Fuhrmann,Ch. Wöll +7 more
TL;DR: In this article, the surface-phonon dispersion curves of commensurate Xe monolayers on Cu(111) and incommensurate Ye monlayers on Xe surfaces have been measured using He-atom scattering (HAS) time-of-flight (TOF) spectroscopy.
Comparison of surface phonon dispersion curves for clean and hydrogen covered Rh(111) surfaces
TL;DR: In this paper, surface phonon dispersion curves have been measured for clean and hydrogen covered Rh(111) surfaces along the high symmetry directions of the surface Brillouin zone using high-resolution He-atom scattering.
A new scattering deflection method for determining and selecting the sizes of large liquid clusters of 4He
TL;DR: In this article, a small-angle scattering deflection method was proposed to determine the size distribution of large liquid helium clusters formed by condensation in a supersonic expansion, and the size distributions can be well represented by a log-normal model with mean sizes varying between 3×103 and 104 atoms depending on the source conditions.