High-resolution laser photoionization, photoelectron, and photodissociation studies of state-selected transition metal-hydrides, carbides, nitrides, and oxides

状态选择过渡金属氢化物、碳化物、氮化物和氧化物的高分辨率激光光电离、光电子和光解离研究

• 批准号: 0910488
• 负责人: Cheuk-Yiu Ng
• 金额: $ 42.95万
• 依托单位: University of California-Davis
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-09-15 至 2012-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0910488&HistoricalAwards=false
• 关键词: resolution; laser; photoionization; photoelectron; photodissociation

In this project funded by the Experimental Physical Chemistry Program, Professor Cheuk-Yiu Ng of the University of California, Davis, and his research group will measure the ionization energies, bond dissociation energies, and vibrational and rotational constants of diatomic molecules MX and their cations MX+, where M is a 3d transition metal (M = Sc, Ti, V, Cr, Fe, Co, Ni or Cu) and X is a main group non-metal (X = H, C, N, or O). The general experimental strategy takes advantage of the fact that most MX species possess long-lived, low-lying electronic states that allow a variety of double resonance techniques (initial visible excitation followed by photoionization, photoelectron, or photodissociation) to be applied which can circumvent the normal problems of spectral congestion or signals due to impurity species. Photodissociation studies will involve a two-color velocity-mapped ion-imaging method, which should make it possible to determine accurately not only MX dissociation energies, but the branching ratios of the various dissociation channels.Beyond the specific questions related to diatomic molecules containing transition metals, the techniques developed during this research project will have important impacts in other areas of physical chemistry, astrochemistry, and virtually any other chemical science arena where precise spectral and dissociation energy information is needed. This research project will also provide an excellent vehicle for the training of students and post-doctoral researchers who themselves may go on to develop novel laser based techniques. Finally, Prof. Ng is a participant in the undergraduate research program (MORE/CAMP/MURPPS) for underrepresented minority students at UC Davis.

在这项由实验物理化学计划资助的计划中，加州大学戴维斯分校的吴卓耀教授及其研究小组将测量双原子分子MX及其阳离子MX+（M为3d过渡金属）的电离能、键离解能、振动和转动常数（M = Sc、Ti、V、Cr、Fe、Co、Ni或Cu），X是主族非金属（X = H、C、N或O）。 一般的实验策略利用的事实，即大多数MX物种具有长寿命，低的电子状态，允许各种双共振技术（初始可见光激发，然后光电离，光电子，或光解离）被应用，可以规避正常的问题，由于杂质物种的光谱拥塞或信号。 光解离研究将涉及双色速度映射离子成像方法，该方法不仅可以精确确定MX解离能，还可以精确确定各种解离通道的分支比。除了与含过渡金属的双原子分子相关的具体问题之外，该研究项目期间开发的技术将在物理化学，天体化学，以及几乎任何其他需要精确光谱和离解能信息的化学竞技场。该研究项目还将为学生和博士后研究人员的培训提供一个很好的工具，他们自己可能会继续开发新的激光技术。最后，吴教授是加州大学戴维斯分校为少数民族学生提供的本科研究项目（MORE/CAMP/MURPPS）的参与者。