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We propose a novel method that uses the oscillation of an atomic excited wavepacket observed through a pump-probe technique to accurately determine the zerotime delay between a pair of ultrashort laser pulses. This physically-basedapproach provides an easy fix for the intractable problem of synchronizing twodifferent femtosecond laser pulses in a practical experimental environment,especially where an in situ time zero measurement with high accuracy isrequired.

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In situ accurate determination of the zero time delay between two  independent ultrashort laser pulses by observing the oscillation of an atomic  excited wave packet