Abstract

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Imaging molecular dynamics with laser-driven Coulomb explosion technique

I-04

Imaging molecular dynamics with laser-driven Coulomb explosion technique


C. Wu1*, X. Xie1, Q. Gong1

1Department of Physics and State Key Laboratory for Mesoscopic Physics, Peking University, Beijing 100871, China

The motions of electrons and nuclei are strongly coupled for dissociative ionization of molecules driven by intense laser pulses. The correlation dynamics of electrons and nuclei determine the reaction pathways as well as the quantum states of reaction products. However, experimental study of the correlation dynamics of electrons and nuclei is one of the most challenging topics for polyatomic molecules in intense laser fields. In this talk, I will report our recent progresses in the field of imaging the laser-driven ultrafast dynamics of molecules with Coulomb explosion technique. (1) We clarified the three-body fragmentation dynamics of CO2 in intense laser fields [1,2]. Both sequential fragmentation and non-sequential fragmentation were observed. (2) We identified the electronic state of fragmental ions of Ar3 in intense laser fields. Both the direct Coulomb explosion and the indirect Coulomb explosion with Rydberg excitation were observed. (3) We simulated the explosion dynamics of polyatomic molecules in intense laser fields and reproduced the experimental observations. The simulation clearly demonstrates how the electrons and nuclei are coupled in the process of dissociative ionization of molecules in intense laser fields.

Figure 1: Experimental measured two-dimensional momentum distributions of correlated atomic ions generated in the three-body fragmentation of CO23+.

Figure 1: Experimental measured two-dimensional momentum distributions of correlated atomic ions generated in the three-body fragmentation of CO23+.

References:

[1] C. Wu, et al., Phys. Rev. Lett. 110, 103601 (2013).

[2] C. Wu, et al., J. Chem. Phys. 142, 124303 (2015).