title: Is deuterium always smaller than protium?
authors.affiliation: Organic Chemistry Laboratory, Swiss Federal Institute of Technology, ETH-Zurich HCI H333, 8093 Zurich, Switzerland. dunitz@org.chem.ethz.ch
authors.forename: Jack D
authors.initials: JD
authors.lastname: Dunitz
authors.forename: Richard M
authors.initials: RM
authors.lastname: Ibberson