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Sujet de stage / Master 2 Internship

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Ultrafast relaxation dynamics of isolated nanostructrures in the gas phase

Contact: POISSON Lionel, , lionel.poisson@cea.fr, +33 1 69 08 51 61
Summary:
This experimental project deals with the ultrafast reaction dynamics of isolated nanoparticules in the gas phase. The time resolved pump/probe method is used. It is coupled with velocity map imaging of electrons and ions to characterize the photoelectrons and photoions collected.
Possibility of continuation in PhD: Oui
Deadline for application:30/03/2018

Full description:
In fundamental physical chemistry, reaction dynamics address the behavior of a molecular or atomic structure subject to an energy deposition. Our research Group focusses on isolated structures (in the gas phase) at short time scales (10fs to 100 ps). This project aims at studying isolated nanostructures after an electronic excitation. Atomic or molecular clusters and nanoparticules will be investigated. Depending on their electronic structures the relaxation dynamics of these species is expected to be quite different. For example, salt nanoparticules should behave differently than gold nanoparticules which have a metal structure. Although the objective of this project is fundamental research, it is useful to mention that the nanoparticles that we shall study can find an application as as constituents in photovoltaic cells and quantum computers.

In such structures, electronic orbitals overlap. Hence, electronic states interact strongly and build excitonic states. Excitons are thus formed upon electronic excitation. The latter are expected to scatter in the material and to relax as localized excited state. This project will focus on this relaxation dynamics that is worth to study.
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