Prelude to Hot Chemistry: Preliminary Studies on the Collisional Dynamics of Highly Vibrationally Excited Molecules

波士顿大学的艾米·穆林博士得到了实验研究的支持。 化学系物理化学专业与研究 规划补助金，以研究碰撞和反应动力学的高度 振动激发的多原子分子。 这些物种将 通过紫外激光激发，然后快速内 转换为基态电子态的高振动能级。 初步研究将集中在能源之间的转移 振动激发的吡嗪或吡啶与二氧化碳和水反应。 产品状态分布和绝对截面将 测定了 最终，将进行实验以研究 高水平的内部兴奋的能力，以推动其他 非反应性系统通过活化屏障。 大多数化学反应发生在分子的基态电子态上。 反应物 大的活化屏障可以防止反应发生 即使系统处于高温下， 在这 Mullin教授的项目将使用激光激发来填充高密度 这些分子的振动能级，对应于 3000K的温度，通常会分解的温度 分子。 这种制备方法允许大量的能量 存在于反应物中而不分解它，并增强了反应物的 通过提供足够的能量以克服活化势垒来进行反应。

Dr. Amy Mullin of Boston University is supported by the Experimental Physical Chemistry Program of the Chemistry Division with a Research Planning Grant to study the collisional and reactive dynamics of highly vibrationally excited polyatomic molecules. These species will be prepared by ultraviolet laser excitation followed by rapid internal conversion to high vibrational levels of the ground electronic state. Preliminary studies will concentrate on energy transfer between vibrationally excited pyrazine or pyridine with carbon dioxide and water. Product state distributions and absolute cross sections will be measured. Ultimately, experiments will be conducted to investigate the ability of high levels of internal excitation to drive otherwise unreactive systems over an activation barrier. Most chemical reactions take place on the ground electronic states of the reactants. Large activation barriers can prevent reactions from taking place, even when the systems are at elevated temperatures. In this project, Professor Mullin will use laser excitation to populate high vibrational levels of these molecules, corresponding to vibrational temperatures of 3000K, a temperature which would normally decompose the molecule. This method of preparation allows a large amount of energy to be present in the reactant without decomposing it and enhances the reaction by providing enough energy to overcome the activation barrier.