Vibrational Energy Dynamics in Solute/Solvent Clusters and Solute Dimers

伯恩斯坦和凯利教授得到了 实验物理化学计划在一个合作 激发态电子振动能量动力学研究 小溶质/溶剂团簇和溶质二聚体的状态 形成于超音速分子喷射膨胀。 这些 测量将有助于阐明 各种无辐射的过程参与重新分配 将初始能量转化为其他自由度。 光学激发将制备具有已知量的团簇 在第一激发单重态的振动能量的 溶质发色团 振动动力学将被监控 通过皮秒光谱研究上升和衰减时间 在特定的振动水平的人口， 抽运的母体团簇和自由分子， 预解离 测量将包括时间分辨 发射、双色电离和双色受激 发射泵浦 溶质发色团是芳香的 吖嗪，溶剂包括氨，水，甲烷， 氘代甲烷、氩和四氟化碳。

Professors Bernstein and Kelley are supported by the Experimental Physical Chemistry Program in a collaborative study of vibrational energy dynamics in excited electronic states of small solute/solvent clusters and of solute dimers formed in a supersonic molecular jet expansion. These measurements will help elucidate the relative importance of various radiationless processes involved in redistributing the initial energy into other degrees of freedom. Optical excitation will prepare the clusters with known amounts of vibrational energy in the first excited singlet state of the solute chromophore. The vibrational dynamics will be monitored by picosecond spectroscopic studies of the rise and decay times of the population in specific vibronic levels of both the pumped parent cluster and the free molecule resulting from predissociation. Measurements will include time-resolved emission, two color ionization, and two color stimulated emission pumping. The solute chromophores will be aromatic azines, and the solvents will include ammonia, water, methane, deuterated methane, argon, and carbon tetrafluoride.