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Updated: Jun 22, 2026

Photoelectron Imaging of Anions Illustrated by 310 Nm Detachment of F−
Published on: July 27, 2018
Photodissociation dynamics of IrBr6(2-) dianions by time-resolved photoelectron spectroscopy
Christian Rensing1, Oli T Ehrler, Ji-Ping Yang
1Institut für Physikalische Chemie and DFG-Center for Functional Nanostructures, Universität Karlsruhe (TH), Kaiserstrasse 12, D-76128 Karlsruhe, Germany.
Abstract:
We have used femtosecond time-resolved photoelectron spectroscopy to examine the photodissociation dynamics of doubly charged anions IrBr(6)(2-) after excitation at h nu(pump) = 1.6 eV and with a detachment photon energy of h nu(probe) = 4.8 eV. Excited state dynamics proceed by successive decay of the initially excited state, by way of an intermediate and back to the electronic ground state. This is associated with lifetimes of tau(1) = 2.1+/-0.3 ps and tau(2) = 21+/-2 ps, respectively. After nonadiabatic relaxation, the internal energy of the dianion is sufficiently large to induce fragmentation and delayed emission of Br(-) over the repulsive Coulomb barrier with a 79+/-21 ps time constant. As both fragments are negatively charged, Coulomb repulsion at early times (and correspondingly small separations) is reflected in the transient photoelectron spectra. Analysis of both shifts and intensities of the time-dependent bromide detachment features allows determination of the shape of the dissociation barrier. A lower limit of the outer height was retrieved from the kinetic energy release of KER > or = 1.6 eV. Modeling of the dissociation rate with statistical rate theory results in an inner barrier height of E(RCB) = 0.95 eV.
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