Pan Shengzhe, Zhang Wenbin, Li Hui, Lu Chenxu, Zhang Weihua, Ji Qinying, Li Hanxiao, Sun Fenghao, Qiang Junjie, Chen Fei, Tong Jihong, Zhou Lianrong, Jiang Wenyu, Gong Xiaochun, Lu Peifen, Wu Jian
State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China.
Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China.
Phys Rev Lett. 2021 Feb 12;126(6):063201. doi: 10.1103/PhysRevLett.126.063201.
The dissociative above-threshold double ionization (ATDI) of H_{2} in strong laser fields involves the sequential releasing of two electrons at specific instants with the stretching of the molecular bond. By mapping the releasing instants of two electrons to their emission directions in a multicycle polarization-skewed femtosecond laser pulse, we experimentally clock the dissociative ATDI of H_{2} via distinct photon-number-resolved pathways, which are distinguished in the kinetic energy release spectrum of two protons measured in coincidence. The timings of the experimentally resolved dissociative ATDI pathways are in good accordance with the classical predictions. Our results verify the multiphoton scenario of the dissociative ATDI of H_{2} in both time and energy fashion, strengthening the understanding of the strong-field phenomenon and providing a robust tool with a subcycle time resolution to clock abundant ultrafast dynamics of molecules.
