Observation of autoionization dynamics and sub-cycle quantum beating in electronic molecular wave packets

The coherent interaction with ultrashort light pulses is a powerful strategy for monitoring and controlling the dynamics of wave packets in all states of matter. As light presents an oscillation period of a few femtoseconds (T = 2.6 fs in the near infrared spectral range), an external optical field...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2016-03, Vol.49 (6), p.65102-65112
Main Authors: Reduzzi, M, Chu, W-C, Feng, C, Dubrouil, A, Hummert, J, Calegari, F, Frassetto, F, Poletto, L, Kornilov, O, Nisoli, M, Lin, C-D, Sansone, G
Format: Article
Language:English
Subjects:
attosecond lasers
autoinization
Coherence
Complex systems
Dynamics
electronic wave packets in molecules
Electronics
Extreme ultraviolet radiation
Fano resonances
Femtosecond
Time
transient absorption spectroscopy
Wave packets
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Summary:The coherent interaction with ultrashort light pulses is a powerful strategy for monitoring and controlling the dynamics of wave packets in all states of matter. As light presents an oscillation period of a few femtoseconds (T = 2.6 fs in the near infrared spectral range), an external optical field can induce changes in a medium on the sub-cycle timescale, i.e. in a few hundred attoseconds. In this work, we resolve the dynamics of autoionizing states on the femtosecond timescale and observe the sub-cycle evolution of a coherent electronic wave packet in a diatomic molecule, exploiting a tunable ultrashort extreme ultraviolet pulse and a synchronized infrared field. The experimental observations are based on measuring the variations of the extreme ultraviolet radiation transmitted through the molecular gas. The different mechanisms contributing to the wave packet dynamics are investigated through theoretical simulations and a simple three level model. The method is general and can be extended to the investigation of more complex systems.
ISSN:0953-4075
1361-6455
DOI:10.1088/0953-4075/49/6/065102