Issue 13, 2004

Application of Smoluchowski's generalized theory to the kinetics of triplet–triplet annihilation of anthracene in viscous solution after long-pulse excitation

Abstract

The validity of Smoluchowski's theory is demonstrated by its application to the bimolecular triplet–triplet annihilation (TTA) T1 + T1 → S0 + S1 in viscous solution. For that purpose the delayed S1 → S0 fluorescence of anthracene in cis-1,3-dimethylcyclohexane/trans-1,4-dimethylcyclohexane (1∶1) was measured after UV excitation with long laser pulses (∼30 μs) in a temperature range where TTA is completely diffusion controlled. Through the adequate treatment of the kinetics of TTA upon spatially homogeneous and spatially periodic excitation (which is partially based on the results of previous publications) absolute values for the diffusion coefficients D of triplet molecules, for the effective annihilation distance RA and for the Förster radius RST of heterogeneous annihilation S1 + T1 → S0 + Tn were determined. The temperature dependence of all three parameters (D, RA and RST) is discussed. From the decrease of RA with increasing temperature, the parameters A and L can be determined, which define the exponential distance dependence of the annihilation of a triplet pair in the kinetic model of Butler and Pilling (1977). Differences of the two models and applicability criteria are discussed.

Article information

Article type
Paper
Submitted
22 Dec 2003
Accepted
31 Mar 2004
First published
09 Jun 2004

Phys. Chem. Chem. Phys., 2004,006, 3350-3363

Application of Smoluchowski's generalized theory to the kinetics of triplet–triplet annihilation of anthracene in viscous solution after long-pulse excitation

B. Nickel, P. Borowicz, A. A. Ruth and J. Troe, Phys. Chem. Chem. Phys., 2004, 006, 3350 DOI: 10.1039/B316805K

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements