Peking University, April 25, 2016: Recently，the team of extreme optics, Prof. Liu Yunquan and Prof. Gong Qihuang, presented a molecular quantum-trajectory Monte Carlo (MO-QTMC) model to describe the laser-driven dynamics of electron process in molecules.
Using this model, they reproduce and explain the alignment-dependent molecular frame photoelectron spectra of strong-field tunneling ionization of N2reported by M. Meckel et al. [Nat. Phys. 10, 594(2014)]. Besides modelling the low-energy photoelectron angular distributions quantitatively, they extract the phase structure of strong-field molecular tunneling wave packets. This sheds light on its physical origin. The initial phase of the tunneling wavepackets at the tunnel exit depends on both, the initial transverse momentum distribution and the molecular inter nuclear distance. It has been further shown that the ionizing molecular orbital has a critical effect on the initial phase of the tunneling wave packets. Since the phase structure of photoelectron wavepacket is a key ingredient, this work has important implications for modelling strong-field molecular photoelectron holography, high-harmonic generation and molecular orbital imaging.
Edited by: Li Yike & Zhang Jiang
Source: School of Physics
