Terahertz Polaron Oscillations of Electrons Solvated in Liquid Water
Terahertz Polaron Oscillations of Electrons Solvated in Liquid Water
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DOI：
10.1103/physrevlett.126.097401
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发表时间：
2021-03-03
影响因子：
8.6
通讯作者：
Woerner, Michael
中科院分区：
文献类型：
--
作者：
Ghalgaoui, Ahmed;Fingerhut, Benjamin P.;Woerner, Michael
利用非线性超快泵浦探测实验研究了液态水中溶剂化电子的太赫兹响应。浓度从c（e）= 4到140 x 10（-6）摩尔/升的自由电子由高场THz或近红外多光子激发产生。时间分辨的变化的介电函数映射的宽带太赫兹脉冲表现出明显的振荡持续高达30 ps。它们的频率随着电子浓度的增加而增加，从0.2到1.5 THz。振荡响应被分配到脉冲激发相干极化子涉及耦合电子和水壳层运动的频率设置由当地电场。
The terahertz (THz) response of solvated electrons in liquid water is studied in nonlinear ultrafast pumpprobe experiments. Free electrons with concentrations from c(e) = 4 to 140 x 10(-6) moles/liter are generated by high-field THz or near-infrared multiphoton excitation. The time-resolved change of the dielectric function as mapped by broadband THz pulses exhibits pronounced oscillations persisting up to 30 ps. Their frequency increases with electron concentration from 0.2 to 1.5 THz. The oscillatory response is assigned to impulsively excited coherent polarons involving coupled electron and water shell motions with a frequency set by the local electric field.