We have investigated the nucleation and growth of crystalline ice in 0.24 μm thick, supercooled water films adsorbed on Pt(111). The films were transiently heated with ∼10 ns infrared laser pulses, which produced typical heating and cooling rates of ∼10⁹–10¹⁰ K/s. The crystallization of these water films was monitored with infrared spectroscopy. The experimental conditions were chosen to suppress ice nucleation at both the water/metal and water/vacuum interfaces. Furthermore, internal pressure increases due to curvature effects are precluded in these flat films. Therefore, the experiments were sensitive to the homogeneous ice nucleation rate from ∼210 to 225 K. The experiments show that J_max, the maximum for the homogeneous ice nucleation rate, J(T), needs to be ≥10²⁶ m^–3 s^–1 and is likely to be ∼10^29±2 m^–3 s^–1. We argue that such large nucleation rates are consistent with experiments on hyperquenched glassy water, which typically have crystalline fractions of ∼1% or more.

中文翻译：

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瞬时加热过冷液态水膜中冰的均相成核

我们已经研究了在Pt（111）上吸附的0.24μm厚的过冷水膜中结晶冰的形核和生长。用约10 ns的红外激光脉冲对薄膜进行瞬时加热，产生的典型加热和冷却速率为约^{10 9} –10 ¹⁰ K / s。这些水膜的结晶用红外光谱法监测。选择实验条件以抑制水/金属和水/真空界面处的冰成核。此外，在这些平坦的膜中，由于曲率效应而导致的内部压力的上升被排除在外。因此，实验对约210至225 K的均匀冰成核率敏感。实验表明，均匀冰成核率的最大值J _max，Ĵ（Ť），需要是≥10 ²⁶米^-3小号^-1和很可能是〜10 ^29±2米^-3小号^-1。我们认为，如此大的成核速率与超淬火玻璃水的实验一致，该玻璃水的结晶分数通常约为1％或更高。