Programme

O.10 -- Oral, VCTP-44

Date: Tuesday, 30 July 2019

Time: 11:20 - 11:40

Quantum method for probing molecular chirality of enatiomer specific coherent pi-electron angular momentum

Hirobumi Mineo (1)

(1) Ton Duc Thang University

Detection of molecular chirality is one of the important topics and chirality is an essential concept for a discussion of the stereochemistry. In biochemistry many biologically active molecules are chiral molecules including the amino acids and sugars. In natural biological system most of these naturally produced chiral molecules have the specific chirality, e.x., amino acids have L-enatiomers, and sugars have the D-enatiomers, while the chemically synthetic chiral molecules have both L-, D-enatiomers equally. Therefore the concept of molecular chirality and its detection are practically very important. The circular dichloism (CD) or optical rotatory dispersion (ORD) spectroscopy techniques are typically used to investigate the electronic and geometric structures of chiral molecules in UV/Vis frequency region, however the observed strengths of CD and ORD are very week due to its indirect spectroscopic methods. Recently some ultrafast new methods are proposed, imaging photoelectron CD (PECD) or multiphoton (PECD) to discriminate the chiral molecules. In this paper we propose an efficient laser control scheme for a ultrafast probing the enatiomers of chiral aromatic ring molecules using the linealy polarized (LP) laser pulses. Here phenylalanine, which is an essential amino acids, is used as an example of chiral aromatic ring molecules to demonstrate a numerical simulation of this laser control scenario. In our previous work we utilized the dynamic Stark effect (DSE) to generate the unidirectional pi-electron angular momentum. Here the two electronic excited states are subject to dynamical Stark shift, and the degeneracy is induced by the two LP stationary lasers.

Presenter: Hirobumi Mineo