We report theoretical investigations of vibronic quantum beats (QBs) which can be observed in the molecular dissociation under the intense infrared (IR) laser pump-IR laser probe scheme. We show how the vibronic coherences can be probed by analyzing the interchannel QB signals obtained from the numerical solution of the time-dependent Schrödinger equation (TDSE) and the quantum Liouville equation in combination with the strong-field approximation for the treatment of coherences between multiple states of the target ion. The validities of our methods are first tested on a one-dimensional model of H2+, for which exact solutions of the TDSE can be obtained. We then illustrate our method using an example of O2, for which various experiments have been reported recently. The case of an attosecond pump pulse is also considered. Our results indicate that the strong-field dissociation pump-probe experiments are capable of providing information on the vibronic coherences that complements other techniques such as attosecond transient absorption spectroscopy.
S. Xue et al., "Vibronic Coherence and Quantum Beats of O₂⁺ based on Laser Pump-Probe Dissociation Dynamics," Physical Review A, vol. 104, no. 1, article no. 013101, American Physical Society (APS), Jul 2021.
The definitive version is available at https://doi.org/10.1103/PhysRevA.104.013101
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01 Jul 2021