(1) Laboratoire de Photophysique Moléculaire du CNRS, Batiment 210, Université Paris-Sud, 91405 Orsay Cedex, France;(2) Laboratoire Aimé Cotton du CNRS, Batiment 505, Université Paris-Sud, 91405 Orsay Cedex, France
Abstract:
The vibrational dynamics of DCl molecules embedded in different
cryogenic matrices is studied by time resolved infrared Degenerate Four Wave
Mixing experiments using the infrared free electron laser CLIO. The
coherence behaviour of the D-Cl stretch in pure argon as well as in
mixed argon/nitrogen van der Waals solids is investigated.
Different interactions between the excited molecules and their
environment are probed: the van der Waals interaction between the
trapped molecules and the solid lattice and the interaction binding
complexes trapped in the matrix (either the vdW interaction between
DCl and nitrogen or weak H bonds in (DCl)n clusters). The dependence
of the dephasing time on the
solid and on specific interactions is clearly observed.