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.




This work was supported by the National Natural Science Foundation of China (NSFC) (Grants No. 11904146, No. 11874030, and No. 12064023), the Natural Science Foundation of Gansu Province (Grant No. 20JR5RA209), and the Scientific Research Program of the Higher Education Institutions of Gansu Province of China (Grant No. 2020A-125).

International Standard Serial Number (ISSN)

2469-9926; 2469-9934

Document Type

Article - Journal

Document Version

Final Version

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© 2021 American Physical Society (APS), All rights reserved.

Publication Date

01 Jul 2021

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Physics Commons