We introduce time-resolved multielectron coincidence spectroscopy and apply it to the double Auger-Meitner (AM) emission process following xenon 4d photoionization. The photoelectron and AM electron(s) are measured in coincidence by using a magnetic-bottle time-of-flight spectrometer, enabling an unambiguous assignment of the complete cascade pathways involving two AM electron emissions. In the presence of a near-infrared (NIR) laser pulse, the intermediate Xe2+* state embedded in the Xe³⁺ continuum is probed through single NIR photon absorption and the lifetime of this intermediate Xe2+* state is directly obtained as (109±22) fs.
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Zhang et al. (2024) studied this question.
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