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To measure and control the electron motion in atoms and molecules by thestrong laser field on the attosecond time scale is one of the researchfrontiers of atomic and molecular photophysics. It involves many new phenomenaand processes and raises a series of questions of concepts, theories andmethods. Recent studies show that the Coulomb potential can cause theionization time lag (about 100 attoseconds) between instants of the fieldmaximum and the ionization-rate maximum. This lag can be understood as theresponse time of the electronic wave function to the strong-field-inducedionization event. It has a profound influence on the subsequent ultrafastdynamics of the ionized electron and can significantly change thetime-frequency properties of electron trajectory (an important theoretical toolfor attosecond measurement). Here, the research progress of response time andits implications on attosecond measurement are briefly introduced.

Strong-field response time and its implications on attosecond measurement