AI Article Synopsis
- Liquid water exhibits rapid molecular motion and strong electric field fluctuations due to the dipolar nature of water molecules.
- These fluctuations can lead to tunnel ionization of water when influenced by an external terahertz (THz) pulse, making this ionization irreversible.
- Time-resolved THz spectroscopy reveals how the movement and localization of freed electrons affect the absorption spectrum and refractive index of water, showcasing a complex interaction between local and external electric fields in water dynamics.
Article Abstract
Liquid water at ambient temperature displays ultrafast molecular motions and concomitant fluctuations of very strong electric fields originating from the dipolar HO molecules. We show that such random intermolecular fields induce the tunnel ionization of water molecules, which becomes irreversible if an external terahertz (THz) pulse imposes an additional directed electric field on the liquid. Time-resolved nonlinear THz spectroscopy maps charge separation, transport, and localization of the released electrons on a few-picosecond time scale. The highly polarizable localized electrons modify the THz absorption spectrum and refractive index of water, a manifestation of a highly nonlinear response. Our results demonstrate how the interplay of local electric field fluctuations and external electric fields allows for steering charge dynamics and dielectric properties in aqueous systems.
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Source |
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7503859 | PMC |
| http://dx.doi.org/10.1021/acs.jpclett.0c02312 | DOI Listing |
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