Steady-state and time-resolved studies

of adsorbate bonding by pumped SFG spectroscopy

A. A. Villaeys1*, M. Zouari2

1 Institut de Physique et Chimie des Matériaux de Strasbourg, 23, rue du Loess, 67037 Strasbourg Cedex, France

2 Groupe Polymères, Photonique et Optoélectronique, Faculté des Sciences de Bizerte 7021 Zarzouna, Tunisie

* Corresponding author. E-mail : jalloul.balti@fsb.rnu.tn

Received : 03 May 2002; revised version accepted : 20 January 2003

Abstract

Sum-frequency generation, is a sensitive tool to test molecular adsorbates due to the non-centrosymmetry introduced by the surface. While these techniques are mostly used in the steady-state regime, time-resolved experiments can be done, as well. For instance, time-resolved second-harmonic generation, have been used to study intermolecular energy transfer or structural phase transitions. The recent introduction of an additional pump beam makes the description more difficult. Here, we are faced to a five-wave mixing process supported by the adsorbate. It is our goal to describe the dynamical evolution involved in this five-wave mixing process. The various contributions will be analyzed on the same footing for the steady-state and time-resolved situations. Finally, some prospective on new situations where infrared and visible probe pulses can be delayed, will be introduced.

Keywords : Adsorbate; Steady-state; SFG spectroscopy.

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