Presidential Young Investigator Award/Molecular Dynamics and Energy Transfer in Photochemical Reactions

劳里巴特勒博士得到了一位总统青年的支持 研究者补助金形式的物理化学计划， 研究气相分子的光致碎裂， 用激光辐射电子激发。 巴特勒博士正在研究快速偶极-偶极诱发的 电子能量在两个发色团之间的转移， 分子。 特别是，她正在研究这一性质， 在1，2-C2 F4 BrI断裂中的能量转移，其中C-I和 C-Br初始激发后的C-Br裂变竞争 排斥面 这项工作特别重要，因为， 如果这种分子内的能量转移可以被抑制， 可能设想选择性激发和分裂 个人债券。 巴特勒博士还利用发射光谱法， 解离分子来研究排斥分子之间的交叉点 电子状态，改变解离途径， 多原子分子 巴特勒医生的测量结果 实验室提供了关于这种非绝热 分离，从而允许确定核间 分离，相对速度和电子能量， 以及到达路口所需的时间。 巴特勒博士的研究是为了解决 关于初始电子激发 可能会导致许多细胞之间的特异性解离通道 被允许的人。 通过测量产品速度， 内能和产物的角分布， 可以直接解决有关重新分配的问题， 激光激发产生的电子能量。

Dr. Laurie Butler is supported by a Presidential Young investigator Grant form the Physical Chemistry Program to study photofragmentation of gas phase molecules which have been electronically excited with laser radiation. Dr. Butler is studying the rapid dipole-dipole induced transfer of electronic energy between two chromophores in a molecule. In particular, she is studying the nature of this energy transfer in 1,2-C2F4BrI fragmentation in which C-I and C-Br fission compete following initial excitation to the C-Br repulsive surface. This work is particularly important since, if this intramolecular energy transfer could be suppressed, one might conceive of selective excitation and fragmentation of individual bonds. Dr. Butler is also utilizing emission spectroscopy of dissociating molecules to study intersections between repulsive electronic states which alter the dissociation pathways of polyatomic molecules. Measurements made in Dr. Butler's laboratory provide detailed data on such nonadiabatic dissociations thus permitting the determination of internuclear separation, relative velocity, and electronic energy at the crossing as well as the time required to reach the crossing. Dr. Butler's research is addressing fundamental questions regarding the process by which an initial electronic excitation may result in specific dissociation channels among many energetically allowed ones. By measuring product velocities, internal energies, and angular distributions of products, she can directly address qustions regarding the redistribution of electronic energy produced by laser excitation.