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We study the temporal aspects of laser-assisted extreme ultraviolet (XUV) photoionization using attosecond pulses of harmonic radiation. The aim of this paper is to establish the general form of the phase of the relevant transition amplitudes and to make the connection with the time-delays that have been recently measured in experiments. We find that the overall phase contains two distinct types of...
A method to determine the dynamics of a bound wave packet excited by an attosecond pulse, while - for the first time - keeping track of its spectral content with high precision, is presented. The key idea is that coincident with the creation of the bound wave packet, a broad continuum wave packet is launched . This free wave packet serves as a reference when, after a variable delay, the bound wave...
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