The photoionization dynamics based on molecular pre-orientation

Meng-Lin Zhou; Jie Yu; Gao-Ren Wang; Shu-Lin Cong

doi:10.1016/j.saa.2019.01.021

The photoionization dynamics based on molecular pre-orientation

Spectrochim Acta A Mol Biomol Spectrosc. 2019 Apr 15:213:48-56. doi: 10.1016/j.saa.2019.01.021. Epub 2019 Jan 17.

Authors

Meng-Lin Zhou¹, Jie Yu², Gao-Ren Wang¹, Shu-Lin Cong¹

Affiliations

¹ School of Physics, Dalian University of Technology, Dalian 116024, China.
² School of Physics, Dalian University of Technology, Dalian 116024, China. Electronic address: yujie@dlut.edu.cn.

PMID: 30685559
DOI: 10.1016/j.saa.2019.01.021

Abstract

We study theoretically the photoionization dynamics of pre-oriented NaK molecule. Firstly, a THz laser pulse is utilized to orient the ground state molecule. And then the pump and probe laser pulses are used to excite and ionize the molecule, respectively. We study the influence of molecular orientation duration and degree on the ionization probability, angle-resolved photoelectron spectrum and photoelectron angular distribution (PAD). It is shown that we could obtain more stable ionization signal and PAD when the molecules are ionized in molecular orientation duration. We could increase the ionization probability and obtain more concentrated ionization signal and photoelectron distribution by increasing the orientation degree in the ground state. Moreover, we discuss the splitting pattern in the angle-resolved photoelectron spectrum.

Keywords: Angle-resolved photoelectron spectrum; Ionization probability; PAD; Pre-orientation; Pump-probe photoionization.