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首页> 外文期刊>Crystal growth & design >Polarization switching of crystal structure in the nonphotochemical laser-induced nucleation of supersaturated aqueous L-histidine
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Polarization switching of crystal structure in the nonphotochemical laser-induced nucleation of supersaturated aqueous L-histidine

机译：在非光化学激光诱导的过饱和L-组氨酸水溶液成核中晶体结构的偏振转换

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摘要

Polarization switching of polymorphs has been observed in the nonphotochemical laser-induced nucleation of aqueous L-histidine in the supersaturation range 1.40-1.60. Exposure of solutions to 0.24 GW/cm(2), 7 ns pulses of 532 nm light induced the nucleation of different polymorphs of L-histidine depending on polarization state of the light. Circularly polarized laser pulses tended to nucleate the orthorhombic A polymorph, whereas linearly polarized pulses tended to nucleate a mixture of the orthorhombic A and monoclinic B polymorphs. Higher supersaturation also favors the formation of mixed polymorphs. These observations support the hypothesis that the laser is organizing hydrogen-bonded groups of histidine molecules through an optical Kerr alignment.
机译：在过饱和范围1.40-1.60中，在非光化学激光诱导的L-组氨酸水溶液成核中观察到多晶型物的偏振转换。溶液暴露于0.24 GW / cm（2），7 ns的532 nm脉冲下，会诱导L-组氨酸的不同多晶型物成核，具体取决于光的偏振态。圆偏振激光脉冲趋向于使正交晶体A多晶型物成核，而线性偏振脉冲趋向于使正交晶体A和单斜晶B多晶型物的混合物成核。较高的过饱和度也有利于混合多晶型物的形成。这些观察结果支持以下假设：激光通过光学Kerr排列来组织组氨酸分子的氢键结合。

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