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The excited states of novel monomeric and oligomeric squaraines of the indole series were studied by two-photon fluorescence (TPF). Two-photon excitation scans have been performed in an energy range from 1.75 to 3.2 eV by linearly and circularly polarized light. In addition, results from linear absorption and fluorescence measurements are presented. For the monomers a two-photon transition into the...
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