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Recent advances in the ultrashort laser technology have spawned a series of new directions of research in atomic and molecular physics. This work compounds two studies on the control and probing of atomic matter by ultrafast laser pulses. The first study is concerned with the control of quantum wavepackets focusing by chirped, ultrashort laser pulses. The ability to control wavepacket focusing is important for the achievement of specific excitation pathways, for controlling chemical reactivity or even molecular synthesis. In this work, we present a general method for wavepacket control in the weak field limit. Numerical simulations involving the ICN molecule confirm our theoretical framework. The second study refers to the ionization of sodium Rydberg states via halfcycle pulses (HCPs). For this process, our full quantummechanical calculations demonstrate an asymmetry in both ionization rates and ionization spectrum between the downhill (Stark redshifted) and uphill (Stark blue shifted) states. The asymmetry is explained by appealing to a semiclassical model of the interfering ionization pathways.
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birth defects, or other reproductive harm.
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