Molecular Beam Overtone Spectroscopy

在化学学部物理化学计划的这个项目中，印第安纳大学的James Reilly教授将使用高分辨率泛音光谱来研究在超音速膨胀中播种的高振动激发的多原子分子。他将在选定的化合物中寻找表明弱振动模式耦合的高分辨率结构，并研究具有宽、无结构的室温光谱的分子。目标是开始理解振动模式混合和动力学在高激发分子。当多余的能量沉积到多原子分子的振动模式中，即那些由几个原子组成的分子，这些能量可以通过在分子中的其他振动中重新分配而在内部消散。或者，它也可能被传递给其他原子或分子，与受激发的分子发生碰撞。该项目旨在研究这些多余的振动能量如何从分子的初始激发部分流出。这些信息对于那些想要了解化学反应中释放的多余能量如何影响这些反应过程的科学家来说是很重要的。

In this project in the Physical Chemistry Program of the Chemistry Division, Professor James Reilly of Indiana University will use high resolution overtone spectroscopy to study highly vibrationally excited polyatomic molecules seeded in supersonic expansions. He will search for high resolution structure indicative of weak vibrational mode couplings in selected compounds as well as look at molecules with broad, structureless room temperature spectra. The goal is to begin to understand vibrational mode mixing and dynamics in highly excited molecules. %%% When excess energy is deposited into vibrational modes of polyatomic molecules, that is, those molecules composed of several atoms, that energy can dissipate internally by redistributing among the other vibrations in the molecule, or it may be given up to other atoms or molecules with which the excited molecule collides. This project aims at studying the ways in which such excess vibrational energy flows out of the initially excited parts of a molecule. Such information is important to scientists interested in understanding how the excess energy released in chemical reactions can affect the course of these reactions.