Scientific Results

Optical Kerr effect of liquid and supercooled water: The experimental and data analysis perspective

Year: 2014

Authors: Taschin A., Bartolini P., Eramo R., Righini R., Torre R.

Autors Affiliation: European Lab. for Non-Linear Spectroscopy (LENS), Univ. di Firenze, via N. Carrara 1, I-50019 Sesto Fiorentino, Firenze, Italy;
Istituto Nazionale Ottica, CNR, Largo Fermi 6, I-50125 Firenze, Italy;
Dip. di Chimica, Univ. di Firenze, via Della Lastruccia 13, I-50019 Sesto Fiorentino, Firenze, Italy;
Dip. di Fisica e Astronomia, Univ. di Firenze, via Sansone 1, I-50019 Sesto Fiorentino, Firenze, Italy

Abstract: The time-resolved optical Kerr effect spectroscopy (OKE) is a powerful experimental tool enabling accurate investigations of the dynamic phenomena in molecular liquids. We introduced innovative experimental and fitting procedures, that enable a safe deconvolution of sample response function from the instrumental function. This is a critical issue in order to measure the dynamics of liquid water. We report OKE data on water measuring intermolecular vibrations and the structural relaxation processes in an extended temperature range, inclusive of the supercooled states. The unpreceded data quality makes possible a solid comparison with few theoretical models: the multi-mode Brownian oscillator model, the Kubo

Journal/Review: JOURNAL OF CHEMICAL PHYSICS

Volume: 141 (8)      Pages from: 084507  to: 084507

More Information: This work was supported by Regione Toscana, prog. POR-CRO-FSE-UNIFI-26, by Ente Cassa di Risparmio Firenze, prog. 2012-0584, and by MIUR, prog. PRIN-2010ERFKXL-004. We acknowledge M. De Pas, A. Montori, and M. Giuntini for providing their continuous assistance in the electronic set-ups and R. Ballerini and A. Hajeb for the mechanical realizations.
KeyWords: Dynamics; Optical Kerr effect; Structural relaxation; Supercooling, Brownian oscillators; Instrumental function; Intermolecular vibrations; Kerr effect spectroscopy; Lower temperatures; Molecular information; Response functions; Temperature range, Liquids
DOI: 10.1063/1.4893557

Citations: 11
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English