Credit: Light: science & applications
The electron emitted from Ar atom is firstly trapped to the highly excited transient states of the Ar-Kr+* before its eventual releasing to the continuum. A linearly polarized pump laser pulse is used to prepare the Ar-Kr+ ion by removing e1 from Kr site, and a time delayed elliptically polarized probe laser pulse is used to track the electron transfer mediated electron tunnelling dynamics (e2, orange arrow).