title: Stability of the ground state vinylidene anion H2CC-
abstract: A technique to measure very low collisionless decay rates of ionic species has been applied at a new electrostatic storage ring to obtain the rate for spontaneous rearrangement of the vinylidene anion to neutral acetylene. The measurement yields a rate of k(0) = (0.009+/-0.006) s(-1), corresponding to a natural lifetime of the vinylidene anion of tau(0) approximately 110 s.
authors.affiliation: Institute of Physics and Astronomy, University of Aarhus, DK-8000 Arhus C, Denmark.
authors.initials: MJ
authors.lastname: Jensen
authors.initials: UV
authors.lastname: Pedersen
authors.initials: LH
authors.lastname: Andersen