화학공학소재연구정보센터
Journal of Chemical Physics, Vol.103, No.4, 1292-1296, 1995
Inhibition of Fluorescence Emission in a Donor Molecule upon Interaction with an Excited Acceptor
We present results of a strong laser field interacting with a two-center system. The two centers consist of a donor and acceptor pair which are coupled by Foerster-Dexter resonance energy transfer. The donor molecule is the indole chromophore in indolylethylenediaminetetraacetic acid (indolyl-EDTA) which chelates the lanthanide ion acceptor holmium (Ko(3+)). Th, changes in the donor lifetime consequent upon excitation of the acceptor were examined. Excitation of the lanthanide acceptor with a second laser field resulted in the appearance of a substantially increased lifetime component. This additional (new) lifetime component is on the order of a second, compared with the original nanosecond lifetime of the donor in its complex with the acceptor. This new component is not attributable to the spontaneous lifetime of the acceptor. Rather, we propose that the large lifetime is due to the interaction of the donor with the excited state acceptor.