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要旨:
In this
work the laser-induced ionization of atoms and simple molecules is experimentally investigated
by using a Reaction Microscope and sculpted laser pulses. The Reaction Microscope
allows to distinguish different ionization channels with the ion-electron coincidence
technique. The sculpted laser pulses, which are realized by superposition of two laser
pulses with different colors and adjustable relative phase, play a key role in controlling
the electronic wavepacket with high temporal resolution.
With these two methods, phase-controllable strong-field ionization of Ar and N2 is studied
and electrons emitted from single ionization of Ar and N2 are compared. Moreover,
channel-selective electron emission is investigated for the fundamental molecular case of
H2. A significant difference in the low-energy photoelectron yield between bound and
dissociative ionization channel is observed, proving the Born-Oppenheimer-based twostep
process is not complete. Finally, this observation is understood as the population and
subsequent decay of autoionizing states by further investigations with the two-color laser
pulses.
