title: Rydberg trimers and excited dimers bound by internal quantum reflection.
abstract: In a combined experimental and theoretical effort we report on two novel types of ultracold long-range Rydberg molecules. First, we demonstrate the creation of triatomic molecules of one Rydberg atom and two ground-state atoms in a single-step photoassociation. Second, we assign a series of excited dimer states that are bound by a so far unexplored mechanism based on internal quantum reflection at a steep potential drop. The properties of the Rydberg molecules identified in this work qualify them as prototypes for a new type of chemistry at ultracold temperatures.
authors.affiliation: 5. Physikalisches Institut, Universität Stuttgart, Pfaffenwaldring 57, 70569 Stuttgart, Germany. v.bendkowsky@physik.uni-stuttgart.de
authors.forename: V
authors.initials: V
authors.lastname: Bendkowsky
authors.forename: B
authors.initials: B
authors.lastname: Butscher
authors.forename: J
authors.initials: J
authors.lastname: Nipper
authors.forename: J B
authors.initials: JB
authors.lastname: Balewski
authors.forename: J P
authors.initials: JP
authors.lastname: Shaffer
authors.forename: R
authors.initials: R
authors.lastname: Löw
authors.forename: T
authors.initials: T
authors.lastname: Pfau
authors.forename: W
authors.initials: W
authors.lastname: Li
authors.forename: J
authors.initials: J
authors.lastname: Stanojevic
authors.forename: T
authors.initials: T
authors.lastname: Pohl
authors.forename: J M
authors.initials: JM
authors.lastname: Rost