Tracking the nuclear-wave-packet dynamics on excited bound states of Ar2+ in strong laser fields

作者：Shi, Menghang^*; Lu, Chenxu; Pan, Shengzhe; Zhou, Lianrong; Ni, Hongcheng; Lu, Peifen; Zhang, Wenbin; Wu, Jian

来源：Physical Review A - Atomic, Molecular, and Optical Physics, 2023, 108(4): 043108.

DOI：10.1103/PhysRevA.108.043108

• RADIATIVE CHARGE-TRANSFER
• AB-INITIO
• MOMENTUM SPECTROSCOPY
• ELECTRONIC STATES
• RECOIL-ION
• KR-2(+)
• DECAY

We experimentally investigated the photoionization and fragmentation of a van der Waals cluster of argon dimer (Ar2) exposed to intense laser fields. By performing femtosecond pump-probe experiments in a reaction microscope, we tracked the spatiotemporal evolution of the nuclear wave packet (NWP) launching onto the excited bound states of Ar2+. By interrogating the measured time-resolved vibrational structures in the kinetic energy spectra obtained from Coulomb explosion imaging of the Ar2+ NWP, the vibrational revival and rotational excitation of the long-living rovibrational NWP were observed in real time. The vibrational populations of the NWP on the potential curves of three excited bound states of Ar2+, i.e., I(3/2)g, II(1/2)u, and I(3/2)u, were identified by the Fourier analysis of the time-dependent kinetic energy spectra of nuclear fragments.

• 单位
  中国科学院