Stability and Cooling of the C_{7}^{2-} Dianion

Author(s)

P. K. Najeeb, M. H. Stockett, E. K. Anderson, M. K. Kristiansson, P. Reinhed, A. Simonsson, S. Rosén, R. D. Thomas, K. C. Chartkunchand, H. Gnaser, R. Golser, D. Hanstorp, Å. Larson, H. Cederquist, H. T. Schmidt, H. Zettergren

Abstract

We have studied the stability of the smallest long-lived all carbon molecular dianion (C72-) in new time domains and with a single ion at a time using a cryogenic electrostatic ion-beam storage ring. We observe spontaneous electron emission from internally excited dianions on millisecond timescales and monitor the survival of single colder C72- molecules on much longer timescales. We find that their intrinsic lifetime exceeds several minutes - 6 orders of magnitude longer than established from earlier experiments on C72-. This is consistent with our calculations of vertical electron detachment energies predicting one inherently stable isomer and one isomer which is stable or effectively stable behind a large Coulomb barrier for C72-→C7-+e- separation.

Organisation(s)

Isotope Physics

External organisation(s)

Stockholm University, Ulmer Fundamental Symmetries Laboratory, University of Gothenburg, Universität Wien

Journal

Physical Review Letters

Volume

131

No. of pages

6

ISSN

0031-9007

DOI

https://doi.org/10.1103/PhysRevLett.131.113003

Publication date

09-2023

Peer reviewed

Yes

Austrian Fields of Science 2012

103013 Ion physics

ASJC Scopus subject areas

Physics and Astronomy(all)

Portal url

https://ucris.univie.ac.at/portal/en/publications/stability-and-cooling-of-the-c72-dianion(9ec94667-b4cf-4ee6-8751-4767ad10649b).html