title: Structural evolution of small ruthenium cluster anions.
abstract: The structures of ruthenium cluster anions have been investigated using a combination of trapped ion electron diffraction and density functional theory computations in the size range from eight to twenty atoms. In this size range, three different structural motifs are found: Ru8(-)-Ru12(-) have simple cubic structures, Ru13(-)-Ru16(-) form double layered hexagonal structures, and larger clusters form close packed motifs. For Ru17(-), we find hexagonal close packed stacking, whereas octahedral structures occur for Ru18(-)-Ru20(-). Our calculations also predict simple cubic structures for the smaller clusters Ru4(-)-Ru7(-), which were not accessible to electron diffraction measurements.
authors.affiliation: Institut für Nanotechnologie, Karlsruher Institut für Technologie, Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Eugen
authors.initials: E
authors.lastname: Waldt
authors.affiliation: Institute für Physikalische Chemie, Karlsruher Institut für Technologie, Kaiserstrasse 12, 76128 Karlsruhe, Germany.
authors.forename: Anna-Sophia
authors.initials: AS
authors.lastname: Hehn
authors.affiliation: Institute für Physikalische Chemie, Karlsruher Institut für Technologie, Kaiserstrasse 12, 76128 Karlsruhe, Germany.
authors.forename: Reinhart
authors.initials: R
authors.lastname: Ahlrichs
authors.affiliation: Institut für Nanotechnologie, Karlsruher Institut für Technologie, Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Manfred M
authors.initials: MM
authors.lastname: Kappes
authors.affiliation: Institut für Nanotechnologie, Karlsruher Institut für Technologie, Postfach 3640, 76021 Karlsruhe, Germany.
authors.forename: Detlef
authors.initials: D
authors.lastname: Schooss