Photodissociation dynamics of cyclopropenylidene, c-C3 H2.

Photodissociation dynamics of cyclopropenylidene, c-C3 H2.
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亚环丙烯,c-C3 H2 的光解动力学

DOI:
10.1002/chem.201501624
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发表时间:
2015
期刊:
影响因子:
--
通讯作者:
I. Fischer
I. Fischer
中科院分区:
--
文献类型:
--
作者:
M. S. Schuurman;J. Giegerich;K. Pachner;D. Lang;B. Kiendl;R. J. MacDonell;A. Krueger;I. Fischer

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在这项联合实验和理论研究中,我们描述了与单重态卡宾环丙烯叉基光激发到最低光学明亮激发电子态相关的完整动力学“生命周期”:从激发态波包的初始创建到分子在振动热基电子态上的最终碎裂。在这项工作中,使用改进的合成途径制备的前体quadricyclane,从而大大简化了测量的photorfragments的分子来源的分配。激发过程和随后的非绝热动力学先前已经使用时间分辨光电子能谱进行了研究,现在用高级从头算轨迹模拟进行了补充,阐明了特定的振动电子弛豫途径。最后,使用速度图成像(VMI)探测分子内部转换后进入的碎片通道,以便确定碎片产物的身份及其相应的能量分布。
In this joint experimental and theoretical study we characterize the complete dynamical “life cycle” associated with the photoexcitation of the singlet carbene cyclopropenylidene to the lowest lying optically bright excited electronic state: from the initial creation of an excited‐state wavepacket to the ultimate fragmentation of the molecule on the vibrationally hot ground electronic state. Cyclopropenylidene is prepared in this work using an improved synthetic pathway for the preparation of the precursor quadricyclane, thereby greatly simplifying the assignment of the molecular origin of the measured photofragments. The excitation process and subsequent non‐adiabatic dynamics have been previously investigated employing time‐resolved photoelectron spectroscopy and are now complemented with high‐level ab initio trajectory simulations that elucidate the specific vibronic relaxation pathways. Lastly, the fragmentation channels accessed by the molecule following internal conversion are probed using velocity map imaging (VMI) so that the identity of the fragmentation products and their corresponding energy distributions can be definitively assigned.
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