Vibrational analysis on the fluorescence spectrum of p-terphenyl in the crystalline low-temperature phase

Kryschi, Carola; Klüfer, Werner; Kupka, Hans

doi:10.1016/0022-2313(91)90143-j

Cited by 1 publication

(2 citation statements)

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“…While the absorption is smeared out by the wide vibronic progression from the torsional motion, the emission spectrum is well-structured (Fig. 1), and is characterized by the coupling with two modes of frequency 1614 and 1286 cm À1 , according to the fluorescence spectrum of crystalline pTP at 4.2 K. 40,41 Since we are interested in the vibrational relaxation processes of these two dyes, excitation with a large excess energy is required. The 290 nm excitation used in the present experiment corresponds to an excess vibrational energy of B4500 cm À1 in PPO and B2500 cm À1 in pTP, with respect to the absorption threshold.…”

Section: Introductionmentioning

confidence: 99%

“…, according to the fluorescence spectrum of crystalline pTP at 4.2 K. 40,41 Since we are interested in the vibrational relaxation processes of these two dyes, excitation with a large excess energy is required. The 290 nm excitation used in the present experiment corresponds to an excess vibrational energy of B4500 cm À1 in PPO and B2500 cm À1 in pTP, with respect to the absorption threshold.…”

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

Braem

Penfold

Cannizzo

et al. 2012

Phys. Chem. Chem. Phys.

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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 (42000 cm À1 ). 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 o200 fs.

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confidence: 99%

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confidence: 99%