Infrared Laser Spectroscopy

莱斯大学的罗伯特·F·柯尔博士是由化学部物理化学项目资助的红外激光光谱学研究。氰甲基(HCCN)、羟甲基、甲氧基、乙氧基的高分辨率激光红外光谱。三重态偏亚甲基将被用来分析电子结构、势面和内部动力学。对HCCN的兴趣从低激活到围绕肝细胞癌角度的弯曲；将产生这种弯曲运动的实验推导的势。在非对称CH伸缩模式中，甲氧基的Jahn-Teller离散性尤其明显。实验确定的势面将被用来解释Jahn-Teller效应。三线态亚乙叉是乙炔的高能异构体。将测量旋转光谱，以便可以明确地指定该异构体的结构。连续波量子级联激光器的调谐范围将扩大，使其在扩展腔激光器结构中运行，使其更适合于一般光谱用途。高分辨率红外振动和转动光谱在确定重要基团的结构中的应用为基本的成键和结构问题提供了重要的见解。许多这样的自由基在化学过程中很重要，而且活性很高，因此很难分析，因为寿命很短。莱斯大学的柯尔博士的研究将提供对这些自由基的新测量，这将促进我们对重要化学自由基的基本理解，涉及它们的结构和反应活性。

Dr. Robert F. Curl of Rice University is funded for his research on infrarerd laser spectroscopy by the Physical Chemistry Program of the Chemistry Division. High resolution laser infrared spectroscopy of cyanomethylene (HCCN), hydroxymethyl, methoxy, vinoxy. and triplet vinylidene will be used to analyze the electronic structures, potential surfaces, and internal dynamics. Interest in HCCN eminates from the low activation to bending about the HCC angle; an experimentally derived potential for this bending motion will be generated. Jahn-Teller distorions in methoxy should be particularly evident in the unsymmetrical CH stretching modes. The experimentally determined potential surface will be used to elucidate the Jahn-Teller effect. Triplet vinylidene is a high energy isomer of acetylene. The rotational spectrum will be measured so that the structure of this isomer can be unequivocally assigned. The tuning range of cw quantum cascade lasers will be increased so as to make such lasers more ueful for general spectroscopic purposes by operating them in an extended cavity laser configuration. The value of the wider tuning window in infrared laser spectroscopy will be demonstrated experimentally.The use of high resolution infrared vibrational and rotational spectra in structure determinations of significant radicals provides important insight into basic bonding and structural questions. Many such radicals are important in chemical processes and are highly reactive, and are therefore difficult to analyze because of fleeting lifetimes. The studies by Dr. Curl at Rice University will provide novel measurements of such radicals that will advance our basic understanding of important chemical radicals, with respect to their structure and their reactivity.