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Two-Photon and Cooperative Excitation of an Infinite Chromophore Chain
V. A. Markel
Optoelectronics, Instrumentation and Data Processing 1993, No.6, 3-12 Received February 4, 1993
Translated from:
Автометрия 1993, № 6, стр. 3-13
The paper deals with two channels of optical excitation of an infinite chromophore chain: two-photon (step-wise) excitation and cooperative excitation (summation of energy of two closest neighbors in one of them). Steady-state populations of the first and second excited electronic states of the chromophores have been found The cooperative processes result in correlation of chromophore electronic level populations in a chain. It is taken into account accurately. To calculate the populations, the distribution function of state occupation numbers for an infinite chain is found and an analogy with the one-dimensional Ising model is used. It is shown that the cooperative processes can lead either to increase or to decrease in the population of the higher electronic levels, depending on the excitation conditions. The theoretical results are verified by numerical calculations.
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