Polarization independence of laser-induced nucleation in supersaturated aqueous urea solutions.
Polarization independence of laser-induced nucleation in supersaturated aqueous urea solutions.
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DOI：
10.1039/c6cp07997k
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发表时间：
2017-02
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影响因子：
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通讯作者：
Yao Liu;M. R. Ward;A. Alexander
中科院分区：
文献类型：
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作者：
Yao Liu;M. R. Ward;A. Alexander
在一份关于过饱和水溶液中激光诱导成核的开创性报告中(物理学。启。（1996, 77, 3475）注意到尿素的针状晶体与线偏振激光脉冲的电场方向排列一致。研究结果提出了一种新的控制晶体成核的机制，涉及溶质分子的排列（光学克尔效应），现在通常被称为非光化学激光诱导成核（NPLIN）。近年来的理论和实验工作对光学克尔效应的机理提出了质疑。在这封信中，我们展示了激光诱导成核后脲晶体生长的数字成像结果。数据分析表明，晶体角度与线极化方向之间无统计学意义的相关关系。该结果推翻了长期以来形成NPLIN理论和实验研究的结果。
In a seminal report on laser-induced nucleation in aqueous supersaturated solutions (Phys. Rev. Lett., 1996, 77, 3475) it was noted that needle-shaped crystals of urea were aligned with the direction of the electric field of the linearly polarized laser pulse. The results gave rise to a new mechanism for control of crystal nucleation involving alignment of solute molecules (optical Kerr effect) now commonly known as non-photochemical laser-induced nucleation (NPLIN). Recent theoretical and experimental work has cast doubts on the optical Kerr effect mechanism. In the present letter we present results from digital imaging of urea-crystal growth immediately following laser-induced nucleation. Analysis of the data shows no statistically significant correlation between crystal angle and direction of linear polarization. The results overturn a long-held result that has shaped theoretical and experimental studies of NPLIN.