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Updated: Jun 23, 2026

An Analog Macroscopic Technique for Studying Molecular Hydrodynamic Processes in Dense Gases and Liquids
Published on: December 4, 2017
State-resolved vibrational dynamics of Ar-Kr
Shuqi Li1, Jiujiang Wang1, Junping Wang2
1State Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai 200241, China.
Abstract:
We report a state-resolved study of ultrafast vibrational dynamics in the singly ionized heteronuclear dimer Ar-Kr using a femtosecond pump-probe reaction microscope. A linearly polarized pump pulse initiates the dynamics by ionizing the neutral dimer and preparing a coherent superposition of vibrational states on multiple electronic potential energy surfaces of Ar-Kr+. A time-delayed, circularly polarized probe pulse then induces further ionization and dissociation, allowing the evolving nuclear motion to be mapped onto the time-dependent kinetic-energy-release spectra of the fragments. The resulting time- and KER-resolved measurements reveal vibrational revivals at characteristic delays, each serving as a spectroscopic signature of a specific electronic state and exhibiting agreement with numerical simulations. Fourier analysis of the delay-dependent spectra further extracts the vibrational beating frequencies, which are consistent with established spectroscopic constants.
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