Chirped attosecond photoelectron spectroscopy.
We study analytically the photoionization of a coherent superposition of electronic states and show that chirped pulses can measure attosecond time scale electron dynamics just as effectively as transform-limited attosecond pulses of the same bandwidth. The chirped pulse with a frequency-dependent phase creates the interfering photoelectron amplitudes that measure the electron dynamics. We show that at a given pump-probe time delay the differential asymmetry oscillates as a function of photoelectron energy. Our results suggest that the important parameter for attosecond science is not the pulse duration, but the bandwidth of phased radiation.
Yudin
G L
GL
Laboratoire de Chimie Théorique, Université de Sherbrooke, Sherbrooke, Québec J1K 2R1, Canada.
Bandrauk
A D
AD
Corkum
P B
PB