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1 Bulletin of the Polish Academy of Sciences. Chemistry

1 1999

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Motion of hydrogen bonds in liquid water: direct observation in real time

Bratos S., Gale G. M., Gallot G., Hache F., Lascoux N., Leicknam J-Cl.

Bulletin of the Polish Academy of Sciences. Chemistry

1999

Vol. 47, No. 4

273-281

An experiment is described to study temporal variations of the hydrogen bond length in liquid water. The principles of this laser spectroscopic experiment are explained first. The construction of a laser source generating 150 fs pulses in the 2.5-4.4 um spectral region is detailed next. The theoretical analysis is proposed in terms of statistical mechanics of nonlinear optical processes. A new spectral effect is reported, the pump-probe delay dependent solvatochromic shift of the OH band. It is shown how this effect can be exploited to "photograph" the dynamics of the OH...O bonds in real time.