American Chemical Society
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Ultrafast Dynamics of Pyrene Excimer Formation in Y Zeolites

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journal contribution
posted on 2004-09-02, 00:00 authored by Karen A. W. Y. Cheng, Norman P. Schepp, Frances L. Cozens
Pyrene excimer emission in alkali-metal-exchanged zeolites is readily observed to grow in using an ultrafast streak camera with 3.3 ps time-resolution. Rise-time constants range from 7 to 14 ps depending on the composition of the zeolite. These results show that two pyrene molecules in doubly occupied cavities must move from their pre-excitation orientation into the face-to-face orientation required for the excimer.