Tunneling site of electrons in strong-field-enhanced ionization of molecules

Cheng Huang, Pengfei Lan, Yueming Zhou, Qingbin Zhang, Kunlong Liu, and Peixiang Lu

Phys. Rev. A 90, 043420 – Published 31 October 2014

Abstract

We investigated electron emissions in strong-field-enhanced ionization of asymmetric diatomic molecules by quantum calculations. It is demonstrated that the widely used intuitive physical picture, i.e., electron wave-packet direct ionization from the up-field site (DIU), is incomplete. Besides DIU, we find another two ionization channels: the field-induced excitation with subsequent ionization from the down-field site and that from the up-field site. The contributions from these channels depend on the molecular asymmetry and internuclear distance. Our work provides a more comprehensive physical picture for the long-standing issue about enhanced ionization of diatomic molecules.

Received 2 December 2013

DOI:https://doi.org/10.1103/PhysRevA.90.043420

Authors & Affiliations

Cheng Huang^1,2, Pengfei Lan^1,*, Yueming Zhou¹, Qingbin Zhang¹, Kunlong Liu¹, and Peixiang Lu^1,†

¹School of Physics and Key Laboratory of Fundamental Physical Quantities Measurement of Ministry of Education, Huazhong University of Science and Technology, Wuhan 430074, People's Republic of China
²School of Physics, Southwest University, Chongqing 400715, People's Republic of China

^*Corresponding author: pengfeilan@hust.edu.cn
^†Corresponding author: lupeixiang@mail.hust.edu.cn

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Vol. 90, Iss. 4 — October 2014

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