成像高维多通道势能面:光致脱附负离子H~-(NH_3)和NH_4~-
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- 英文论文题名：Imaging a Multidimensional Multichannel Potential Energy Surface:Photodetachment of H~-(NH_3) and NH_4~-
- 论文作者：宋宏伟 ; Qichi Hu ; Christopher J.Johnson ; 李军 ; Hua Guo ; Robert E.Continetti
- 英文论文作者：Hongwei Song ; Qichi Hu ; Christopher J.Johnson ; Jun Li ; Hua Guo ; Robert E.Continetti ; Wuhan Institute of Physics and Mathematics ; Chinese Academy of Sciences ; Department of Chemistry and Biochemistry ; University of California ; School of Chemistry and Chemical Engineering ; Chongqing University ; Department of Chemistry and Chemical Biology ; University of New Mexico
- 年：2016
- 作者机构：中国科学院武汉物理与数学研究所;Department of Chemistry and Biochemistry,University of California;重庆大学化学化工学院;Department of Chemistry and Chemical Biology,University of New Mexico;
- 论文关键词：量子动力学 ; 多原子体系 ; 光电-光解碎片符合谱 ; 多通道反应
- 会议召开时间：2016-07-01
- 会议录名称：中国化学会第30届学术年会摘要集-第四十四分会：化学动力学
- 语种：中文
- 分类号：O641.1
- 学会代码：ZGHY
- 会议名称：中国化学会第30届学术年会-第四十四分会 ; 化学动力学
- 会议地点：中国辽宁大连
- 主办单位：中国化学会
- 学会名称：中国化学会
- 页数：1
- 文件大小：212k
- 原文格式：D
- 会议级别：全国
摘要
对于多原子分子体系势能面的探测一般依赖于光谱实验或碰撞实验,其中光谱数据反映束缚态区域的结构,而碰撞实验数据反映连续谱区域的结构。本文中,我们报道了一种联合的光谱学和半碰撞方案,成像高维多通道体系核运动的动力学过程。里德堡自由基NH_4和双里德堡负离子NH_4~-是非常典型的多原子体系,可以作为多原子分子体系电子结构和九维量子动力学计算的基准。光致脱附离子-电偶极复合物H~-(NH_3)和双里德堡负离子NH_4~-可以探测NH_4中性势能面的不同区域。量子动力学模拟的光电子谱与实验测量符合较好。光电子-光解碎片符合谱实验显示初期生成的里德堡自由基NH_4解离成H原子和NH_3分子,产物分子的平动能分布在0.13eV位置存在一个峰,表明NH_4的基态不稳定,其通过隧穿诱导解离,并且该解离发生的时间尺度超过了量子动力学模拟的范围。
Probes of the Born-Oppenheimer potential energy surfaces governing polyatomic molecules often rely on spectroscopy for the bound regions or collision experiments in the continuum. A combined spectroscopic and half-collision approach to image nuclear dynamics in a multidimensional and multichannel system is reported. The Rydberg radical NH_4 and the double Rydberg anion(DRA) NH_4~- represent a polyatomic system for benchmarking electronic structure and nine-dimensional quantum dynamics calculations. Photodetachment of the H~-(NH_3) ion-dipole complex and the NH_4~- DRA probes different regions on the neutral NH_4 PES. Photoelectron energy and angular distributions at photon energies of 1.17, 1.60 and 2.33 eV compare well with quantum dynamics. Photoelectron-photofragment coincidence experiments indicate dissociation of the nascent NH_4 Rydberg radical occurs to H + NH_3 with a peak kinetic energy of 0.13 eV, showing the ground state of NH_4 to be unstable, decaying by tunneling-induced dissociation on a timescale beyond the scope of multidimensional quantum dynamics.
Probes of the Born-Oppenheimer potential energy surfaces governing polyatomic molecules often rely on spectroscopy for the bound regions or collision experiments in the continuum. A combined spectroscopic and half-collision approach to image nuclear dynamics in a multidimensional and multichannel system is reported. The Rydberg radical NH_4 and the double Rydberg anion(DRA) NH_4~- represent a polyatomic system for benchmarking electronic structure and nine-dimensional quantum dynamics calculations. Photodetachment of the H~-(NH_3) ion-dipole complex and the NH_4~- DRA probes different regions on the neutral NH_4 PES. Photoelectron energy and angular distributions at photon energies of 1.17, 1.60 and 2.33 eV compare well with quantum dynamics. Photoelectron-photofragment coincidence experiments indicate dissociation of the nascent NH_4 Rydberg radical occurs to H + NH_3 with a peak kinetic energy of 0.13 eV, showing the ground state of NH_4 to be unstable, decaying by tunneling-induced dissociation on a timescale beyond the scope of multidimensional quantum dynamics.
引文
[1]Song,H.;Li,J.;Yang,M.;Lu,Y.;Guo,H.Phys.Chem.Chem.Phys.2014,16:17770.
[2]Song,H.;Guo,H.J.Chem.Phys.2014,141:244311.
[3]Li,J.;Guo H.Phys.Chem.Chem.Phys.2014,16:6753
[2]Song,H.;Guo,H.J.Chem.Phys.2014,141:244311.
[3]Li,J.;Guo H.Phys.Chem.Chem.Phys.2014,16:6753