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Scanning the energy dissipation process of energetic materials based on excited state relaxation and vibration–vibration coupling 下载免费PDF全文
The energy dissipation mechanism of energetic materials(EMs) is very important for keeping safety. We choose nitrobenzene as a model of EM and employ transient absorption(TA) spectroscopy and time-resolved coherent anti-stokes Raman scattering(CARS) to clarify its energy dissipation mechanism. The TA data confirms that the excited nitrobenzene spends about 16 ps finishing the twist intramolecular charge transfer from benzene to nitro group, and dissipates its energy through the rapid vibration relaxation in the initial excited state. And then the dynamics of vibrational modes(VMs) in the ground state of nitrobenzene, which are located at 682 cm~(-1)(v_1), 854 cm~(-1)(v_2), 1006 cm~(-1)(v_3), and 1023 cm~(-1)(v_4),is scanned by CARS. It exhibits that the excess energy of nitrobenzene on the ground state would further dissipate through intramolecular vibrational redistribution based on the vibrational cooling of vi and v_2 modes, v_1 and v_4 modes, and v_3 and v_4 modes. Moreover, the vibration-vibration coupling depends not only on the energy levels of VMs, but also on the spatial position of chemical bonds relative to the VM. 相似文献
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通过比较分析聚(9,9-二辛基芴)(PFO)和聚(9,9-二辛基芴-共-苯并噻二唑)(F8BT),对半导体聚合物的光物理特性进行了系统研究. 量子化学计算显示,苯并噻二唑单元的引入促进了链内电荷转移(ICT),调节了聚合物的电子跃迁机制. 瞬态吸收测定表明,在单分散系统中的受激PFO衰减时主要表现为链内激子弛豫.在F8BT溶液中,ICT状态出现,并参与到激发态的弛豫过程中. 凝聚相中PFO和F8BT的弛豫过程加速和显示了在高激发强度下具有显著的激子湮灭行为. 在相同的激发强度下,F8BT的平均寿命长于PFO,有助于实现良好的电荷离域. 相似文献
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本文检测SQ02在氯苯溶液、Al2O3薄膜和TiO2薄膜中的弛豫过程,从而探究SQ02在单分散态和聚集态下的光物理性质以及相应过程中界面电荷转移过程.实验数据表明,单分散态下SQ02 的寿命约为2 ns,但是,在Al2O3薄膜中显著减小到21 ps.电子从激发态SQ02转移到TiO2薄膜的时间约为2.6 ps,摄入电子量约为89.1%,与基于SQ02的染料敏化太阳能电池光电效应的效率相匹配.此外,一些染料和其他染料一起嵌入纳米晶薄膜中的弛豫时间可达到60 ps.由于其远离TiO2界面,因此不参与界面电荷转移. 相似文献
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