Purchase of an Electron Paramagnetic Resonance (EPR) Spectrometer

这份来自化学研究仪器项目的合同将帮助位于博尔德的科罗拉多大学化学系获得一台具有可变温度控制的电子顺磁共振（EPR）光谱仪。EPR将由五名教员用来表征各种液体和固体有机体系中的自由基反应中间体。电子共振是吸收光谱学的一个分支，其中微波频率的辐射被具有不成对自旋电子的分子吸收。在电子顺磁共振波谱（EPR）中，当施加磁场时产生两种不同的能态，并且在微波区吸收量子辐射时发生两种不同的电子自旋能态之间的跃迁。当一个未配对的电子靠近一个自旋的原子核时，就会发生相互作用，使吸收信号分裂成几个分量。从这种相互作用可以推断出分子结构。EPR光谱学也用于反应速率的研究和涉及反应中产生的自由基中间体的研究。

This award from the Chemistry Research Instrumentation Program will help the Department of Chemistry at the University of Colorado at Boulder acquire an Electron Paramagnetic Resonance (EPR) spectrometer with variable temperature controls. The EPR will be used by five faculty members to characterize free radical reactive intermediates in a variety of liquid and solid organic systems. Electron resonance is a branch of absorption spectroscopy in which radiation of microwave frequency is absorbed by molecules possessing electrons with unpaired spins. In electron paramagnetic resonance spectroscopy (EPR) two different energy states arise when a magnetic field is applied and a transition between the two different electron spin energy states occurs upon absorption of a quantum of radiation in the microwave region. When an unpaired electron comes in the vicinity of a nucleus with a spin, an interaction takes place which causes the absorption signal to be split into several components. From this interaction molecular structure can be inferred. EPR spectroscopy is also used in studies of the rates of reactions and in studies involving radical intermediates produced in a reaction.