Photodissociation dynamics of CO3
Photodissociation dynamics of CO3
复制标题
CO3 的光解动力学
DOI：
10.1063/1.448786
复制
发表时间：
1985
影响因子：
4.4
通讯作者：
A. Castleman
中科院分区：
文献类型：
--
作者：
D. Hunton;M. Hofmann;T. G. Lindeman;A. Castleman
用一种新的光解谱仪研究了CO3−光解动力学，该光解谱仪允许动能分辨检测母离子和光碎片。研究了激光功率和背景压力对光刻碎片强度的影响，并给出了光刻碎片的动能释放分布、光解光谱。在1.95 ~ 2.2 eV能量范围内，CO3 -光解作用可产生CO2+O -碎片，并通过两种不同的机制发生。这些机制涉及与CO2+O−- 2B1基态，2A1弱束缚态和排斥性2B2态相关的三个电子态。第一种机制始于低截面2A1←2B1跃迁，使光谱具有结构。从这个中间态，第二个光子将离子带到2B2态。对观察到的光碎片的解离在排斥表面上迅速发生。在这种双光子机制中，至少有20%的可用能量被用于光的相对平移。
The dynamics of CO3− photodissociation is studied with a new photodissociation spectrometer that allows kinetic energy‐resolved detection of parent ions and photofragments. Kinetic energy release distributions, photodissociation spectra, and the dependence of the photofragment intensity on the laser power and background pressure are presented. Photodissociation of CO3− in the energy range 1.95–2.2 eV leads to CO2+O− fragments, and is found to occur by two distinct mechanisms. These mechanisms involve three electronic states that correlate with CO2+O−—the 2B1 ground state, a 2A1 weakly bound state, and a repulsive 2B2 state. The first mechanism begins with a low cross section 2A1 ← 2B1 transition that gives structure to the spectra. From this intermediate state, a second photon carries the ion to the 2B2 state. Dissociation to the observed photofragments occurs rapidly on the repulsive surface. In this two photon mechanism, at least 20% of the available energy is disposed of in relative translation of phot...