New Spectroscopic Tool for Cluster Science: Nonexponential Laser Fluence Dependence of Photofragmentation

26 February 1996

journal article
research article
Published by American Physical Society (APS) in Physical Review Letters

Vol. 76 (9), 1445-1448
https://doi.org/10.1103/physrevlett.76.1445

Abstract

The photodestruction of

{Hg}_{7}^{+ +}

and

{Hg}_{9}^{+ +}

has been measured as a function of photon flux. A polarization dependent deviation from a purely exponential intensity decrease was observed in both cases. This effect, which in essence is an alignment phenomenon, can be used to characterize dissociating electronic transitions of molecules and clusters. For the clusters studied it is due to a one-dimensional transition dipole moment having a fixed direction within the cluster. The effect is expected to play a role in many photoabsorption experiments where molecule/cluster ionization or fragmentation is studied under high photon fluxes.

Keywords

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