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Tracking molecular structure deformation of nitrobenzene and its torsion-vibration coupling by intense pumping CARS 下载免费PDF全文
The structural deformation induced by intense laser field of liquid nitrobenzene(NB) molecule,a typical molecule with restricting internal rotation,is tracked by time- and frequency-resolved coherent anti-Stokes.Raman spectroscopy(CARS) technique with an intense pump laser.The CARS spectra of liquid NB show that the NO_2 torsional mode couples with the NO_2 symmetric stretching mode,and the NB molecule undergoes ultrafast structural deformation with a relaxation time of 265 fs.The frequency of NO_2 torsional mode in liquid NB(42 cm~(-1)) at room temperature is found from the sum and difference combination bands involving the NO_2 symmetric stretching mode and torsional mode in time- and frequency-resolved CARS spectra. 相似文献
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通过水解TiCl4制备了锐钛矿结构TiO2纳米粒子, 并用时间分辨荧光光谱研究了5(6)CFL(5(6)-Carboxyfluorescein, 简称5(6)CFL)染料敏化TiO2纳米粒子体系的光致电子转移动力学. 5(6)CFL染料敏化TiO2纳米粒子能形成电荷转移复合物, 这归因于染料分子的激发电子态波函数Ψ(D*)与电荷分离态波函数Ψ(D+ +e-)之间的耦合作用. 当激发5(6)CFL染料敏化TiO2纳米粒子体系时, 电子以两种不同方式注入TiO2纳米粒子导带: 第一, 通过5(6)CFL染料分子的激发态注入; 第二, 从电荷转移复合物(5(6)CFL/TiO2)直接注入. 时间分辨荧光光谱表明, 在水溶液中纯5(6)CFL染料的荧光以寿命为τ1=41 ps (74.4%) 和τ2=3.22 ns (25.6%) 的双e指数衰减, 而5(6)CFL染料敏化TiO2纳米粒子体系的荧光分别以时间常数为τ1=44 ps (90.4%), τ2=478 ps (8.6%) 和τ3=2.41 ns (1.0%) 的三e指数衰减. 本文的研究工作能够为染料敏化太阳能电池的光致电子转移机理提供有价值的参考. 相似文献
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合成了能发射蓝光的锌的配合物.对配合物进行了元素分析、激发光谱、发射光谱、红外光谱进行了研究.利用配合物制成发光二极管的发光层,对其光致和电致发光性能进行了探讨.它能发射蓝光,波长为455 nm,亮度为37.20 cd·m-2 . 相似文献
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This paper mainly introduces the role of isotopes in exploring the origin of life and related principles. In addition, by reviewing the discovery history of isotopes and summarizing the contributions of major scientists, we hope to show the general process of science developments to the public. 相似文献
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