Journal
SCIENCE ADVANCES
Volume 8, Issue 22, Pages -Publisher
AMER ASSOC ADVANCEMENT SCIENCE
DOI: 10.1126/sciadv.abn6848
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Funding
- Deutsche Forschungsgemeinschaft (DFG
- German Research Foundation) through the Cluster of Excellence Advanced Imaging of Matter [EXC 2056, 390715994]
- Collaborative Research Center Light-induced Dynamics and Control of Correlated Quantum Systems [SFB-925, 170620586, KI 482/20-1, LA 1431/5-1]
- Federal Ministry of Education and Research of Germany [05K10CHB]
- UK Engineering and Physical Sciences Research Council [EP/R019509/1, EP/V009192/1]
- UK Science and Technology Facilities Council
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In this study, x-rays are used to create and probe quantum coherence in the photoionized amino acid glycine. The researchers observe the coherent superposition of quantum mechanical eigenstates and the evolution of electronic coherence through delayed x-ray pulses. The experiment provides direct evidence for long-lived electronic coherence in photoionized biomolecules.
Here, we use x-rays to create and probe quantum coherence in the photoionized amino acid glycine. The outgoing photoelectron leaves behind the cation in a coherent superposition of quantum mechanical eigenstates. Delayed x-ray pulses track the induced coherence through resonant x-ray absorption that induces Auger decay and by photoelectron emission from sequential double photoionization. Sinusoidal temporal modulation of the detected signal at early times (0 to 25 fs) is observed in both measurements. Advanced ab initio many-electron simulations allow us to explain the first 25 fs of the detected coherent quantum evolution in terms of the electronic coherence. In the kinematically complete x-ray absorption measurement, we monitor its dynamics for a period of 175 fs and observe an evolving modulation that may implicate the coupling of electronic to vibronic coherence at longer time scales. Our experiment provides a direct support for the existence of long-lived electronic coherence in photoionized biomolecules.
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