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The dynamics of atomic levels resonantly coupled by a coherent and intenseshort high-frequency laser pulse is discussed and it is advocated that thisdynamics is sensitively probed by measuring the spectra of the particlesemitted. It is demonstrated that the time-envelope of this laser pulse givesrise to two waves emitted with a time delay with respect to each other at therising and falling sides of the pulse, which interfere in the time domain. Bycomputing numerically and analyzing explicitly analytically a show-case exampleof sequential two-photon ionization of an atom by resonant laser pulses, weargue that this dynamic interference should be a general phenomenon in thespectroscopy of strong laser fields. The emitted particles do not have to bephotoelectrons. Our results allow also to interpret the already studiedresonant Auger effect of an atom by intense free electron laser pulses, andalso to envisage experiments in which photons are emitted.

Coherent intense resonant laser pulses lead to interference in the time domain observable in the spectrum of the emitted particles