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2021年  第2021卷  第1期

Research Article
Ultrafast Hole Deformation Revealed by Molecular Attosecond Interferometry
Yindong Huang, Jing Zhao, Zheng Shu, Yalei Zhu, Jinlei Liu, Wenpu Dong, Xiaowei Wang, Zhihui Lü, Dongwen Zhang, Jianmin Yuan, Jing Chen, Zengxiu Zhao
2021, 2021(1). doi: 10.34133/2021/9837107

Understanding the evolution of molecular electronic structures is the key to explore and control photochemical reactions and photobiological processes. Subjected to strong laser fields, electronic holes are formed upon ionization and evolve in the attosecond timescale. It is crucial to probe the electronic dynamics in real time with attosecond-temporal and atomic-spatial precision. Here, we present molecular attosecond interferometry that enables the in situ manipulation of holes in carbon dioxide molecules via the interferometry of the phase-locked electrons (propagating in opposite directions) of a laser-triggered rotational wave packet. The joint measurement on high-harmonic and terahertz spectroscopy (HATS) provides a unique tool for understanding electron dynamics from picoseconds to attoseconds. The optimum phases of two-color pulses for controlling the electron wave packet are precisely determined owing to the robust reference provided with the terahertz pulse generation. It is noteworthy that the contribution of HOMO-1 and HOMO-2 increases reflecting the deformation of the hole as the harmonic order increases. Our method can be applied to study hole dynamics of complex molecules and electron correlations during the strong-field process. The threefold control through molecular alignment, laser polarization, and the two-color pulse phase delay allows the precise manipulation of the transient hole paving the way for new advances in attochemistry.

Review Article
Broadband THz Sources from Gases to Liquids
Yiwen E, Liangliang Zhang, Anton Tcypkin, Sergey Kozlov, Cunlin Zhang, X.-C. Zhang
2021, 2021(1). doi: 10.34133/2021/9892763
Ultrafast Science to Capture Ultrafast Motions
Qihuang Gong, Wei Zhao
2021, 2021(1). doi: 10.34133/2021/9765859