Projects per year
We report the first UV laser photodissociation spectra of gas-phase I- · MI (M = Na, K, Cs) alkali halide anionic microclusters. The photodepletion spectra of these clusters display strong absorption bands just below the calculated vertical detachment energies, indicative of the presence of dipole-bound excited states. Photoexcitation at the peak of the transition to the dipole-bound excited state results in production of a primary [MI]- photofragment along with a less intense I- ion. The photofragmentation mechanism of the excited state cluster is discussed in the context of an initial dipole-bound excited state that subsequently relaxes via a vibrational Feschbach resonance. The experiments described have been performed in an electrospray source laser-interfaced quadrupole ion-trap instrument and demonstrated for the first time that dipole-bound excited states can be identified in the relatively high-collision environment of a quadrupole ion-trap, in particular for systems with large dipole moments associated with the presence of charge separation. This indicates considerable potential for future experiments that identify dipole-bound excited states as a "low-resolution" structural probe of biomolecules and molecular charge separation using the instrumentation employed in this work.
Bibliographical note© 2015 AIP Publishing LLC.
- 2 Finished
Computational studies of transition metal complexes bound to nucleobases, nucleosides and nucleotides: Interpreting the gas-phase laser photodissociation spectra
17/03/15 → 31/01/16
Project: Other project › Miscellaneous project
BIOIONS: Biological ions in the gas-phase: New techniques for structural characterization of isolated biomelecular ions
1/10/08 → 30/06/15
Project: Research project (funded) › Research