Raman time-delay in attosecond transient absorption of strong-field created krypton vacancy

Li Wang, Guangru Bai, Xiaowei Wang (), Jing Zhao (), Cheng Gao, Jiacan Wang, Fan Xiao, Wenkai Tao, Pan Song, Qianyu Qiu, Jinlei Liu and Zengxiu Zhao ()
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Li Wang: National University of Defense Technology
Guangru Bai: National University of Defense Technology
Xiaowei Wang: National University of Defense Technology
Jing Zhao: National University of Defense Technology
Cheng Gao: National University of Defense Technology
Jiacan Wang: National University of Defense Technology
Fan Xiao: National University of Defense Technology
Wenkai Tao: National University of Defense Technology
Pan Song: National University of Defense Technology
Qianyu Qiu: National University of Defense Technology
Jinlei Liu: National University of Defense Technology
Zengxiu Zhao: National University of Defense Technology

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: Abstract Strong field ionization injects a transient vacancy in the atom which is entangled to the outgoing photoelectron. When the electron is finally detached, the ion is populated at different excited states with part of coherence information lost. The preserved coherence of matter after interacting with intense short pulses has important consequences on the subsequent nonequilibrium evolution and energy relaxation. Here we employ attosecond transient absorption spectroscopy to measure the time-delay of resonant transitions of krypton vacancy during their creation. We have observed that the absorptions by the two spin-orbit split states are modulated at different paces when varying the time-delay between the near-infrared pumping pulse and the attosecond probing pulse. It is shown that the coupling of the ions with the remaining field leads to a suppression of ionic coherence. Comparison between theory and experiments uncovers that coherent Raman coupling induces time-delay between the resonant absorptions, which provides insight into laser-ion interactions enriching attosecond chronoscopy.

Date: 2024
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DOI: 10.1038/s41467-024-47088-9

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