Upgrade of ESR Facility

哥伦比亚大学化学系将利用 此奖项为购买升级为两个电子自旋 共振（ESR）光谱仪。 这两种工具都能够 在稳态操作中获取ESR谱， 时间分辨ESR实验。 傅里叶变换ESR 方法也将实施。 这两种工具将 配备有能够提供纳秒脉冲的激光器， 样品的激发和顺磁性的产生 临时工 这些工具将由 部门的广泛工作，并将用于 各种最先进的实验，包括： 1)采用时间分辨激光闪光的气相实验 光解研究的可能性， 产生电子自旋的圆偏振光 反应产物的极化; 2)低温实验，研究磁性 新材料的特性; 3)使用时间的室温溶液实验 研究电子极化转移的解析方法 有机三重态和自由基，以阐明 顺磁物质之间的电子交换机制 物种;以及 4)低温电子自旋回波包络调制 （ESEEM）实验，以研究光合反应 中心. %%% 电子自旋共振（ESR）光谱仪是一种仪器， 用于获取分子和电子信息 分子的结构。 它也可以用来获得 自由基的寿命信息， 通常对于肿瘤生长的起始和/或 各种化学反应。

The Department of Chemistry at Columbia University will use this award for the purchase of an upgrade for two electron spin resonance (ESR) spectrometers. Both instruments are capable of acquiring ESR spectra in steady state operation and in time-resolved ESR experiments. Fourier transform (FT) ESR methods will also be implemented. Both instruments will be equipped with lasers capable of providing nanosecond pulses for excitation of samples and the production of paramagnetic transients. The instruments will be used by members of the department for a wide range of work and will be used for a variety of state-of-the-art experiments including: 1) Gas phase experiments employing time resolved laser flash photolysis to investigate the possibility of employing circularly polarized light to produce electron spin polarization of reaction products; 2) Low temperature experiments which investigate the magnetic characteristics of novel materials; 3) Room temperature solution experiments which employ time resolved methods to investigate electron polarization transfer for organic triplet states and radicals in order to elucidate the mechanism of electron exchange between paramagnetic species; and 4) Low temperature electron spin echo envelope modulation (ESEEM) experiments to investigate photosynthetic reaction centers. %%% An electron spin resonance (ESR) spectrometer is an instrument used to obtain information about the molecular and electronic structure of molecules. It may also be used to obtain information about the lifetimes of free radicals which are often essential for the initiation of tumor growth and/or a variety of chemical reactions.