Decoherence and Revival in Attosecond Charge Migration Driven by Non-adiabatic Dynamics.

ABSTRACT: Attosecond charge migration is a periodic evolution of the charge density at specific sites of a molecule on a time scale defined by the energy intervals between the electronic states involved. Here, we report the observation of charge migration in neutral silane (SiH₄) in 690 as, its decoherence within 15 fs, and its revival after 40-50 fs, using X-ray attosecond transient absorption spectroscopy. We observe the migration of charge as pairs of quantum beats with a characteristic spectral phase in the transient spectrum, in agreement with theory. The decay and revival of the degree of electronic coherence is found to be a result of both adiabatic and non-adiabatic dynamics in the populated Rydberg and valence states. The experimental results are supported by fully quantum-mechan

SUBMITTER: Matselyukh DT 

PROVIDER: S-EPMC7613930 | biostudies-literature | 2022 Oct

REPOSITORIES: biostudies-literature