Description du sujet de thèse

A PhD position is available for three years at CELIA laboratory in Bordeaux (www.celia.u-bordeaux.fr) in collaboration with Universidad Autónoma de Madrid (Spain).
Chiral molecules are of paramount importance in biology because they are building blocks of organic matter, including human beings. Chiral molecules appear in pairs of left- and right-handed enantiomers, where their nuclear arrangements present non-superimposable mirror twins. The enantiomers of a chiral molecule interact differently with their environment as soon as this latter presents a chiral character, which is the case of most chemoreceptors of living organisms. Such enantio-sensitive interactions are commonly employed in pharmacology but the underlying mechanisms of chiral recognition are not well understood so far.
We will thus address this problem from a fundamental and theoretical point of view. We will consider the dissociation of chiral dimers consisting of the aggregation of two enantiomers through hydrogen bonds. Dissociation is here interpreted as the inverse process of chiral recognition where enantiomers approach each other. We will successively consider the processes of light-induced dissociative excitation and dissociative ionization. As the distance between the two chiral components increases during the dissociation, we will characterize the chirality of the whole system in terms of the asymmetry of the photoelectron angular distribution resulting from the absorption of ionizing light [1,2]. Taking the response of single enantiomers as reference, this will enable us to define the critical distance where enantiomers start to recognize each other. This project is carried on in the framework of a collaboration with V. Wanie et al (DESY, Hamburg) who will perform the associated experiments on dimer dissociation.
Candidates can apply by sending an email to Bernard Pons, Ismanuel Rabadán, and José Luis Pascual (see the emails above).
References :
[1] S. Beaulieu et al., New. J. Phys. 18, 102002 (2016) ; V. Wanie et al., Nature 630, 109 (2024)
[2] A. Comby et al., J. Phys. Chem. Lett. 7, 4514 (2016) ; V. Blanchet et al., PCCP 23, 25612 (2021)

Contexte de travail

Center for Intense Lasers and Applications (CELIA) - Bordeaux, France: CELIA is a center of excellence for lasers and their interaction with matter. Research is conducted on laser developments and ultrafast laser-matter interactions with atoms, molecules, plasmas, and solids. The candidate will be hosted by a dynamic group of researchers (http://harmodyn.celia.u-bordeaux.fr) and will benefit from the very supportive environment at CELIA. We are committed to creating an inclusive environment for all.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.