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Excited State Absorption in Cubane-Like Transition Metal Clusters

Published online by Cambridge University Press:  15 February 2011

W. Ji ,
H. J. Du  and
S. Shi
W. Ji
Affiliation:
Department of Physics, National University of Singapore, Singapore 0511.
H. J. Du
Affiliation:
Department of Physics, National University of Singapore, Singapore 0511.
S. Shi
Affiliation:
Optical Crystal Laboratory and Department of Chemical Engineering, National University of Singapore, Singapore 0511.
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Abstract

We report an investigation of excited-state absorption in cubane-like transition metal clusters. The fluence-dependent transmittances of the clusters have been measured with using 8-ns laser pulses. Time-resolved transmission measurements show that the triplet-triplet absorption occurs within a few nanoseconds. We have also developed a five-level (two singlet states, two triplet states, and one ionized state) model to simulate the excited-state absorption in these cluster compounds. The comparison between the model and the experimental measurements indicates that the population of the triplet states is created mainly by an ionization-recombination process and the triplet-triplet transitions are responsible for the observed nonlinear absorption.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 374: Symposia ZB – Materials for Optical Limiting , 1994 , 131
Copyright
Copyright © Materials Research Society 1995

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