Rostock 2019 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Ultrafast Multidimensional and Control Approaches

MO 14.7: Vortrag

Mittwoch, 13. März 2019, 15:30–15:45, S HS 001 Biologie

Phase control of complex Fano resonances — •Nicola Mayer, Misha Ivanov, and Oleg Kornilov — Max Born Institute, Max-Born-Straβe 2A, 12489 Berlin, Germany.

Complex Fano resonances are quantum mechanical systems consisting of two or more discrete states coupled to one or more common continua. If the coupling strength to the continuum is comparable to the energy separation between discrete states, an increase of coupling strength leads to a counterintuitive increase of lifetime of one of the discrete states, while the lifetime of the other becomes shorter. This phenomenon is known as interference stabilization [1]. In a previous publication, we showed that this effect may occur in a complex autoionizing resonance in molecular nitrogen [2]. In this contribution, we explore the possibility of controlling the autoionization and population dynamics by using an auxiliary laser pulse. We develop a model for photoelectron experiments employing a three pulse scheme: an XUV pulse is used to excite the autoionizing states, a concomitant control NIR/VIS/UV pulse induces a relative phase shift between the autoionizing amplitudes and the resulting population dynamics is probed by a delayed NIR pulse. We show that depending on the relative phase induced by the control pulse, it is possible to selectively excite the long- or short-lived autoionizing states. Our results pave the way for future experiments where the control pulse sequences can be used both to steer the autoionization dynamics in the well-studied systems and applied as a spectroscopic tool to retrieve the intrinsic electron configuration interaction in unexplored systems.