Femtosecond dynamics of thin films by six-wave mixing

Lin, Shujie, Andrews, David L., Hands, Ian D. and Meech, Stephen R. ORCID: https://orcid.org/0000-0001-5561-2782 (1998) Femtosecond dynamics of thin films by six-wave mixing. Chemical Physics Letters, 285 (5-6). pp. 321-329. ISSN 0009-2614

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The ultrafast dynamics of 10-μm-thick solutions of 4-dimethylamino-4′ nitrostilbene dye are measured by time-resolved non-degenerate six-wave mixing. The six-wave mixing origin of the optically induced second harmonic signal is confirmed. The time domain results are analysed in terms of a higher-order grating scattering model. The slowest relaxation time is shown to arise from orientational relaxation, through its viscosity dependence. It is shown that the observed orientational dynamics reveal the first and third moments of the molecular distribution function. These moments are not available from other experiments. It is also found that orientational relaxation cannot account for all the relaxation kinetics observed in polar solvents. It is proposed that the early time dynamics reflect a time-dependent change in the solute hyperpolarisability in polar solvents.

Item Type: Article
Faculty \ School: Faculty of Science > School of Chemistry
UEA Research Groups: Faculty of Science > Research Groups > Physical and Analytical Chemistry (former - to 2017)
Faculty of Science > Research Groups > Chemistry of Light and Energy
Faculty of Science > Research Groups > Centre for Photonics and Quantum Science
Depositing User: Pure Connector
Date Deposited: 18 Jan 2016 17:04
Last Modified: 09 Feb 2023 13:41
URI: https://ueaeprints.uea.ac.uk/id/eprint/56505
DOI: 10.1016/S0009-2614(98)00083-9


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