COLLABORATIVE RESEARCH: High Resolution Absorption and Emission Spectroscopy of Diatomic Metal Halides, Nitrides and Dimers

在该奖项中，化学结构、动力学和机制计划支持南伊利诺伊大学爱德华斯维尔的Leah O‘Brien教授和密苏里大学圣路易斯分校的James O’Brien教授的合作研究项目。他们和他们的学生将开发一种仪器(ILS-FTS)，该仪器将内腔激光吸收光谱与高分辨率傅里叶变换探测相结合，并将在9500-25000厘米-1的区域工作。拟议的ILS-FTS仪器将利用FTS检测实现的改进的分辨率和波长精度，从而能够在非常宽的光谱范围内获取双原子分子的高分辨率光谱。ILS-FTS仪器将用于：(1)旋转电子研究，如PtCL，在旋转分析中可以分辨和利用比目前使用传统方法更接近旋转带头的谱线；(2)金属二聚体的旋转电子光谱，如Pt2和Pd2，其中分子的旋转常数太小，无法用传统方法测定。ILS-FTS构型可能具有亚多普勒兰姆浸渍(饱和)光谱，允许检测具有超精细相互作用的分子和具有较小旋转常数的分子。FTS的发射研究也是可能的，这将有助于寻找新的金属配体分子。所研究的含金属双原子基具有开放的壳层结构，它能引起核、电子、振动和转动角动量之间的一系列相互作用。这项工作将加深对金属-配体相互作用的理解，并有可能为金属催化的反应提供新的见解。拟议的研究将促进一个主要是本科院校和一个研究型大学的教职员工和学生之间成功的机构间合作的发展。拟议的工作将开辟新的研究领域，加强两所大学的研究基础设施，并将进一步培养学生和教师在当代光谱学和仪器开发方面的技能。该项目还包括一个外展计划，允许有才华的高中生参与研究。

In this award, the Chemical Structure, Dynamics, and Mechanisms Program supports the collaborative research projects of Professors Leah O'Brien, of Southern Illinois University Edwardsville, and James O'Brien, of the University of Missouri, St. Louis. They and their students will develop an instrument (ILS-FTS) that will integrate intracavity laser absorption spectroscopy with high resolution Fourier transform detection, and will operate in the 9,500-25,000 cm-1 region. The proposed ILS-FTS instrument will utilize the improved resolution and wavelength accuracy made possible with FTS detection, enabling the acquisition of high-resolution spectra of diatomic molecules over a very wide spectral range. The ILS-FTS instrument will be used in: (i) rovibrational electronic studies, such as for PtCl, where lines closer to rotational bandheads can be resolved and utilized in the rotational analysis than is possible currently using traditional methods; and (ii) rovibrational electronic spectra of metal dimers, such as Pt2 and Pd2, where the rotational constants for the molecules are too small to be examined using traditional approaches. The ILS-FTS configuration may be capable of sub-Doppler Lamb-dip (saturation) spectroscopy, allowing detection of molecules with hyperfine interactions and those with smaller rotational constants. Emission studies are also possible with the FTS, which will assist in the search for new metal-ligand molecules. The metal-containing diatomic radicals to be studied are characterized by open shell structures, which give rise to a host of interactions between nuclear, electronic, vibrational, and rotational angular momenta.The work will lead to deeper understanding of metal-ligand interactions and potentially provide insight on metal-catalyzed reactions. The proposed research will foster development of a successful inter-institutional collaboration of faculty and students at a primarily undergraduate institution and a research university. The proposed work will open new areas research, enhance the research infrastructure at both Universities, and will further develop students and faculty with skills in contemporary spectroscopy and instrument development. The project also contains an outreach program that will allow talented high school students to participate in the research.