论文标题
液态水不依赖温度独立的非线性terahertz
Temperature-independent non-linear terahertz transmission by liquid water
论文作者
论文摘要
液态水是研究最多的物质之一，但其许多特性很难合理化。水的独特性植根于氢键分子的动态网络，而松弛时间常数约为一秒钟。 Terahertz田地振荡在皮秒级时尺度上，并且本质上适合研究水。非线性Terahertz光谱法的最新进展揭示了水信号的大信号，这些信号已通过不同的，有时是竞争的理论模型来解释。在这里，我们表明，在21°C和4°C下，在〜1 THz处的非线性液体水的非线性传播相等，因此表明最合适的显微镜模型应弱取决于温度。在迄今为止提出的不同机制中，氢键水分子的共振重新定向可能是描述所有当前可用的实验结果的最合适的重新定位。
Liquid water is one of the most studied substances, yet many of its properties are difficult to rationalize. The uniqueness of water is rooted in the dynamic network of hydrogen-bonded molecules with relaxation time constants of about one picosecond. Terahertz fields oscillate on a picosecond timescale and are inherently suited to study water. Recent advances in non-linear terahertz spectroscopy have revealed large signals from water, which have been interpreted with different, sometimes competing, theoretical models. Here we show that the non-linear transmission of liquid water at ~1 THz is equal at 21 °C and 4 °C, thus suggesting that the most appropriate microscopic models should depend weakly on temperature. Among the different mechanisms proposed to date, the resonant reorientation of hydrogen-bonded water molecules might be the most appropriate to describe all of the currently available experimental results.
