...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Journal of Chemical Physics >Diffractive optics based three-pulse photon echo peak shift studies of spectral diffusion in polar liquids: Evidence for long lived frequency correlations
【24h】

Diffractive optics based three-pulse photon echo peak shift studies of spectral diffusion in polar liquids: Evidence for long lived frequency correlations

机译：基于衍射光学技术的极性液体中光谱扩散的三脉冲光子回波峰位移研究：长寿命频率相关性的证据

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We report a three-pulse photon echo peak shift (3PEPS) apparatus adopting a diffractive beam splitter to generate triplets of femtosecond pulses with tilted wave front, which enhances the overlap over the entire aperture in a noncollinear geometry while preserving femtosecond pulse duration. The apparatus provides highly reproducible 3PEPS data including the long time peak shift, a critical parameter to recognize the spectral inhomogeneity in condensed phases. To demonstrate the high performance of our setup and to examine the inhomogeneous line broadening in liquids, we measured 3PEPS of a carbocyanine dye IR125 in several solvents. The solvation dynamics becomes slower for IR125 compared to the typical values reported previously probably due to the multipolar nature of the excitation in this large and flexible probe molecule. More importantly, inhomogeneity was observed unambiguously in all solvents, and it is excitation energy dependent. It was speculated that slow dielectric relaxation and conformational heterogeneity may be responsible for the inhomogeneity.
机译：我们报告了一种三脉冲光子回波峰移（3PEPS）仪器，该仪器采用衍射分束器生成具有倾斜波阵面的飞秒脉冲三重态，从而增强了非共线几何结构中整个孔径的重叠，同时保留了飞秒脉冲的持续时间。该设备可提供高度可重复的3PEPS数据，包括长时间的峰位移，这是识别凝聚相中光谱不均匀性的关键参数。为了证明我们的装置的高性能并检查液体中不均匀的线展宽，我们在几种溶剂中测量了碳菁染料IR125的3PEPS。与IR125相比，IR125的溶剂化动力学变慢，这可能是由于在这种大而灵活的探针分子中激发的多极性质所致。更重要的是，在所有溶剂中均清楚地观察到不均匀性，并且它与激发能有关。据推测，缓慢的介电弛豫和构象异质性可能是不均匀性的原因。

著录项

相似文献

  • 外文文献
  • 中文文献
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号