Spin-lattice relaxation and intersystem crossing in single molecules of terrylene embedded in a p-terphenyl crystal

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• 作者：M. Bia?kowska ; A. Makarewicz ; M. Banasiewicz ; B. Kozankiewicz ; ^{kozank@ifpan.edu.pl}
• 刊名：Chemical Physics Letters
• 出版年：2013
• 出版时间：3 January, 2013
• 年：2013
• 卷：555
• 期：Complete
• 页码：131-134
• 全文大小：478 K

文摘

Thermal evolution of fluorescence intensity correlation functions of single molecules of terrylene in a p-terphenyl crystal was studied and double-exponential decay at 5 K was found to change to a mono-exponential decay above 17.5 K. Such behavior was attributed to spin-lattice relaxation (SLR), which couples the long-lived zero-field triplet spin sublevel T_Z with the short-lived and experimentally unresolved T_X and T_Y sublevels. For two of the studied molecules, which were probably deformed from planar symmetry, we observed overpopulation of the spin sublevel T_Z and activation of the SLR at temperatures above 20 K. The SLR rate constant exhibited Raman relaxation.