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Coherent dynamics of photoexcited green fluorescent proteins
R A Cinelli1, V Tozzini, V Pellegrini
1Scuola Normale Superiore and Istituto Nazionale per la Fisica della Materia, Piazza dei Cavalieri 7, I-56126 Pisa, Italy.
Physical Review Letters
|May 1, 2001
Abstract:
The coherent dynamics of vibronic wave packets in the green fluorescent protein is reported. At room temperature the nonstationary dynamics following impulsive photoexcitation displays an oscillating optical transmissivity pattern with components at 67 fs (497 cm(-1)) and 59 fs (593 cm(-1)). Our results are complemented by ab initio calculations of the vibrational spectrum of the chromophore. This analysis shows the interplay between the dynamics of the aminoacidic structure and the electronic excitation in the primary optical events of green fluorescent proteins.