HYDROCARBONATED RADICALS WITH A C=C CORE
Loading...
Date
1998
Authors
Journal Title
Journal ISSN
Volume Title
Publisher
Ohio State University
Abstract
A series of hydrocarbonated radicals with a C=C core and unpaired electrons have been studied by high-resolution diode laser kinetic spectroscopy. Those molecules are $^{2}C_{2}H, ^{3}C_{2}H_{2}$ and $^{2}C_{2}H_{3}$, which are represented as $(C=C)H_{n} [n=1 to 3]$. Each molecule has shown unique characteristic features. $C_{2}H (X^{2}\Sigma)$ has abnormally low bending mode vibration of which frequency is a half of typical linear molecules. $C_{2}H_{2} (\bar{a}^{3}B_{2})$ is cis-bent, however, trans-isomer is believed to locate energetically close to it. $C_{2}H_{3} (X^{2}A_{1})$ is planer and has a resonant structure in which $\alpha$-proton moves through the potential barrier between two identical local minima by tunneling. After an overview of these radicals this talk will focus on the recent results of the triplet accetylene including the isotope dependence among $C_{2}H_{2}, C_{2}HD$ and $C_{2}D_{2}$. We will discuss the dynamics of internal conversion and isomerization based on the precise molecular constants determined by high resolution spectroscopy and the natural lifetimes determined by kinetic spectroscopy. Finally, it will be reviewed the common characteristic features of these $(C=C)H_{n}$ radicals as a family.
Description
Author Institution: Department of Applied Physics, Tokyo Institute of Technology