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SYCU: Symposium Chirality meets ultrafast

SYCU 1: Chirality meets Ultrafast

SYCU 1.3: Hauptvortrag

Montag, 9. März 2020, 12:00–12:30, e415

Time-dependency in Photoelectron Circular Dichroism: from femtosecond scale to attosecond — •Valerie Blanchet — Centre des Lasers Intenses et Applications — University of Bordeaux, Talence, France

Life is a chiral puzzle based on the stereochemistry of chiral molecules and chiral receptors.Tackling this chiral recognition at the atomic scale by taking into account the electronic cloud is one of the Grails of chemical physics. Meanwhile photoionization can produce strong chiral signals : when photoionization of chiral molecules is induced by circularly polarized light, the 3D-angular distribution of photoelectrons exhibits a forward/backward asymmetry with respect to the laser propagation axis. This effect has been called PhotoElectron Circular Dichroism (PECD) and results from the scattering of the electrons in the chiral molecular potential. It is quantum mechanically described as interferences between partial ionization waves. In this talk, time-resolved PECD will be presented. But is there a temporal correspondence between the interference nature of PECD and the photoemission times of these electrons? We answer this question by using two different experimental setups : a RABBIT (Reconstruction of Attosecond Beatings By Interference of Two-photon transitions) ionization technique with chiral light to which we refer to as CHABBIT and a two-color ionization scheme leading to an Enantiosensitive Sub-Cycle Antisymmetric Response Gated by electric field rOTation (ESCARGOT). In ESCARGOT, we control the instantaneous ellipticity and chirality of the light at the sub-cycle level.