液态水中场致Tunnel电离和太赫兹驱动的电子动力学
Field-Induced Tunneling Ionization and Terahertz-Driven Electron Dynamics in Liquid Water
摘要：
液态水在环境温度下显示出超快的分子运动和伴随的非常强的电场的波动源自偶极H2O分子。我们表明，这种随机的分子间场诱导隧道电离的水分子，这成为不可逆的，如果外部太赫兹（THz）脉冲施加一个额外的定向电场的液体。时间分辨的非线性太赫兹光谱图电荷分离，运输和本地化的几个皮秒的时间尺度上释放的电子。高度极化的局域电子改变了水的太赫兹吸收光谱和折射率，这是高度非线性响应的表现。我们的研究结果表明，如何相互作用的局部电场波动和外部电场允许在水溶液系统中的转向电荷动力学和介电性能。
英文摘要：
Liquid water at ambient temperature displays ultrafast molecular motions and concomitant fluctuations of very strong electric fields originating from the dipolar H2O molecules. We show that such random intermolecular fields induce 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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