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Issue 10, 2012
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A femtosecond fluorescence study of vibrational relaxation and cooling dynamics of UV dyes

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Abstract

We present a femtosecond broad-band fluorescence up-conversion study of the vibrational relaxation dynamics of two UV chromophores, 2,5-diphenyloxazole (PPO) and para-terphenyl (pTP), pumped with a large excess of vibrational energy (>2000 cm−1). The band narrowing of the transient fluorescence spectrum reflects a biphasic cooling process in a few hundreds of fs and a few ps. In the sub-ps regime, our data suggest a structural rearrangement in the excited state, followed by thermalization of the excess energy. These dynamics affect the fluorescence spectra of PPO and pTP in different ways. In PPO, the damping of a low frequency vibrational wavepacket and a significant sub-ps narrowing of the band characterize the vibrational relaxation. In pTP, the latter is faster and appears as a red shift with distortion of the band in <200 fs.

Graphical abstract: A femtosecond fluorescence study of vibrational relaxation and cooling dynamics of UV dyes

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Article information


Submitted
06 Oct 2011
Accepted
16 Jan 2012
First published
17 Jan 2012

Phys. Chem. Chem. Phys., 2012,14, 3513-3519
Article type
Paper

A femtosecond fluorescence study of vibrational relaxation and cooling dynamics of UV dyes

O. Braem, T. J. Penfold, A. Cannizzo and M. Chergui, Phys. Chem. Chem. Phys., 2012, 14, 3513
DOI: 10.1039/C2CP23167K

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