Introduction……                        SFA for XUV +IR
In the case of XUV + IR (weak), further assuming:
Ionization induced by XUV only; Free electrons propagate under IR only
Streaking
Time-resolved spectra:
Probing dynamics;
Measuring attosecond
pulses.
XUV + IR
Measurement in energy (momentum) domain  Information in time-domain
by varying the time-delay
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