论文标题
现场诱导的隧穿电离和晶赫兹驱动的电子动力学
Field-Induced Tunneling Ionization and Terahertz-Driven Electron Dynamics in Liquid Water
论文作者
论文摘要
在环境温度下的液态水显示出源自偶极H2O分子的非常强的电场的超快分子运动和伴随的波动。我们表明，这种随机分子间磁场会诱导水分子的隧道电离，如果外部Terahertz（THz）脉冲在液体上施加了额外的定向电场，则将变得不可逆转。时间分辨的非线性THZ光谱映射图电荷分离，释放电子的运输和定位在几秒钟的时间范围内。高度极化的局部电子修改了水的吸收光谱和折射率，这是高度非线性反应的表现。我们的结果表明，局部电场波动和外部电场的相互作用如何允许水性系统中的转向电荷动力学和介电特性。
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.
