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首页> 外文期刊>Spectrochimica acta, Part A. Molecular and biomolecular spectroscopy >Evidence for disorder in L-alanine lattice detected by pulsed-EPR spectroscopy at cryogenic temperatures
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Evidence for disorder in L-alanine lattice detected by pulsed-EPR spectroscopy at cryogenic temperatures

机译：在低温下通过脉冲EPR光谱检测到L-丙氨酸晶格无序的证据

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摘要

The unusual behavior of lattice dynamics Of L-alanine has been assigned to intermolecular dynamics and localization of vibrational energy. Recent heat capacity and Pulsed-EPR measurements support presence of thermally activated dynamic orientational disorder in the L-alanine lattice below 20 K. In the present Study, the additional evidence for possible thermally activated disordered behavior Of L-alanine lattice have been obtained by investigating dependences of longitudinal relaxation time of first stable L-alanine radical, SARI, on sample cooling rates for the same low temperature interval. The obtained relaxation time by Pulsed-EPR shows clear dependence on cooling rates and this behavior can be explained within two types of suggested spin-lattice relaxation mechanisms for the paramagnetic centers in the hydrogen-bonded organic crystal. (c) 2005 Elsevier B.V. All rights reserved.
机译：L-丙氨酸的晶格动力学的异常行为已被赋予分子间动力学和振动能的局部化。最近的热容量和脉冲EPR测量结果支持了低于20 K的L-丙氨酸晶格中存在热激活的动态取向紊乱。相同低温间隔下，第一个稳定的L-丙氨酸自由基SARI的纵向弛豫时间与样品冷却速率的相关性。通过脉冲-EPR获得的弛豫时间显示出对冷却速率的明显依赖性，这种现象可以用两种类型的建议的自旋晶格弛豫机制来解释，这些机制是氢键合有机晶体中顺磁中心的。 （c）2005 Elsevier B.V.保留所有权利。

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