The two basic approaches underlying most of the metrology of attosecond
pulse trains are compared in the spectral region ~14-24 eV, that is,
the second-order intensity volume autocorrelation and the resolution of
attosecond beating by interference of two photon transitions (RABITT).
They give rather dissimilar pulse durations. It is concluded that for
the present experimental conditions RABITT may underestimate the
duration under measurement, due to variations of the driving intensity,
but in conjunction with theory allows an estimation of the relative
contributions of two different electron trajectories to the
extreme-ultraviolet (XUV) radiation.
http://pra.aps.org/abstract/PRA/v82/i2/e021402
PPT slides...
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