Energy-dependent photoion angular distributions in two-body Coulomb explosions of molecules

Author:

Guo Keyu1ORCID,Li Yingbin2,Li Min1ORCID,Cao Chuanpeng1,Duan Xueqing1,Liu Yang1,Liu Yupeng1,Li Zichen1,Xu Jingkun1,Zhou Yueming1ORCID,Yu Benhai2,Lu Peixiang1

Affiliation:

1. School of Physics and Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology 1 , Wuhan 430074, China

2. College of Physics and Electronic Engineering, Xinyang Normal University 2 , Xinyang 464000, China

Abstract

We experimentally study two-body Coulomb explosions of CO2, O2, and CH3Cl molecules in intense femtosecond laser pulses. We observe an obvious variation in the ionic angular distribution of the fragments with respect to the kinetic energy releases (KERs). Using a classical model based on ab initio potential energy curves, we find that the dependence of the ionic angular distribution on the KER is relevant to the fact that the accurate potential energy deviates significantly from the value determined by applying the Coulomb interaction approximation at a relatively small internuclear distance of the molecule. We show that the KER-dependent ionic angular distribution provides an effective way to determine the critical internuclear distance at which the Coulomb interaction approximation holds or breaks down without relying on the knowledge of the accurate potential energy curves.

Funder

National Key Research and Development Program of China

National Natural Science Foundation of China

Nanhu Scholars Program for Young Scholars of Xinyang Normal University

Publisher

AIP Publishing

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