快速蒸发水滴的收缩揭示了它们的极端过冷
Shrinking of Rapidly Evaporating Water Microdroplets Reveals their Extreme Supercooling
摘要：
微米级水滴在真空中的快速蒸发冷却为研究过冷水-低于熔点但仍然是液体-在远远超过最先进的温度下提供了有吸引力的可能性。然而，在这种极端的实验条件下获得液滴温度的可靠值是具有挑战性的。在这里，从一个流的完全均匀的水滴的拉曼散射中的形态依赖的共振的观察，使我们能够测量的绝对精度优于0.2%的液滴大小的变化，蒸发质量损失。这一发现被证明是至关重要的一个明确的确定液滴温度。特别地，发现一部分初始直径为6379 $\pm$ 12 nm的水滴在低至230.6 $\pm$ 0.6 K时保持液态。我们的研究结果质疑最近报道的较大的过冷水滴的温度估计，并提供有价值的信息，在难以进入的深度过冷制度的液态水的氢键网络。
英文摘要：
The fast evaporative cooling of micrometer-sized water droplets in vacuum offers the appealing possibility to investigate supercooled water - below the melting point but still a liquid - at temperatures far beyond the state-of-the-art. However, it is challenging to obtain a reliable value of the droplet temperature under such extreme experimental conditions. Here, the observation of morphology-dependent resonances in the Raman scattering from a stream of perfectly uniform water droplets has allowed us to measure with an absolute precision of better than 0.2% the variation in droplet size resulting from evaporative mass losses. This finding proved crucial to an unambiguous determination of the droplet temperature. In particular, a fraction of water droplets with initial diameter of 6379$\pm$12 nm were found to remain liquid down to 230.6$\pm$0.6 K. Our results question temperature estimates reported recently for larger supercooled water droplets, and provide valuable information on the hydrogen-bond network in liquid water in the hard-to-access deeply supercooled regime.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
