Xe+ 的形成遵循 Au-Xe 的光解：速度图成像研究。

Xe+ formation following photolysis of Au-Xe: a velocity map imaging study.

机构信息

Department of Chemistry, University of Oxford, Physical and Theoretical Chemistry Laboratory, South Parks Road, Oxford OX1 3QZ, United Kingdom.

出版信息

J Chem Phys. 2011 Mar 7;134(9):094311. doi: 10.1063/1.3556944.

DOI:10.1063/1.3556944

PMID:21384973

Abstract

The photodissociation dynamics of Au-Xe leading to Xe(+) formation via the Ξ(1∕2)-X(2)Σ(+) (v('), 0) band system (41 500-41 800 cm(-1)) have been investigated by velocity map imaging. Five product channels have been indentified, which can be assigned to photoinduced charge transfer followed by photodissociation in either the neutral or the Au-Xe species. For the neutral species, charge transfer occurs via a superexcited Rydberg state prior to dissociative ionization, while single-photon excitation of the gold atom in Au(+)-Xe accesses an (Au(+))∗-Xe excited state that couples to a dissociative continuum in Au-Xe(+). Mechanisms by which charge transfer occurs are proposed, and branching ratios for Xe(+) formation via the superexcited Rydberg state are reported. The bond dissociation energy for the first excited state of Au(+)-Xe is determined to be ∼9720 ± 110 cm(-1).

摘要

通过速度成像图研究了金-氙leading 到 Xe(+) 通过 Ξ(1∕2)-X(2)Σ(+) (v('), 0) 带系统 (41 500-41 800 cm(-1)) 的光解离动力学。已经鉴定出五个产物通道，可以将其分配给中性或 Au-Xe 物种的光诱导电荷转移 followed by 光解。对于中性物种，电荷转移通过超激发的里德伯态发生，然后进行离解电离，而在 Au(+)-Xe 中单光子激发金原子进入 Au(+)-Xe 的 (Au(+))∗-Xe 激发态，该激发态与 Au-Xe(+) 中的离解连续态耦合。提出了电荷转移发生的机制，并报告了通过超激发里德伯态形成 Xe(+) 的分支比。确定 Au(+)-Xe 的第一激发态的键离解能约为 9720 ± 110 cm(-1)。