Ultrafast optical dynamics of HITCI in ethylene glycol. A non-Markovian Brownian oscillator description
✍ Scribed by Wim P. de Boeij; Maxim S. Pshenichnikov; Koos Duppen; Douwe A. Wiersma
- Publisher
- Elsevier Science
- Year
- 1994
- Tongue
- English
- Weight
- 921 KB
- Volume
- 224
- Category
- Article
- ISSN
- 0009-2614
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✦ Synopsis
Femtosecond photon echo, chirped four-wave mixing and pump-probe experiments are re'ported, using a 13 fs cavity-dumped Ti: sapphire laser for excitation. It is shown that the optical dynamics of HITCI in ethylene glycol occurs on distinctly different time scales. The ulirafast solvent response is modelled by a non-Markovian solvent oscillator, while the slow diffisional solvent motions are represented by an overdamped Markovian oscillator. With this model an oscillator-bath time correlation function is obtained that exhibits a bimcdal behaviour: an initial fast Gaussian decay is followed by a slower, long exponential tail.