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Instrumatational development of laser spectroscopic analyzer for mass-selected RF ion trapped species

用于质量选择射频离子捕获物质的激光光谱分析仪的仪器开发

基本信息

批准号：
06554024
负责人：
MIKAMI Naohiko
金额：
$ 6.08万
依托单位：
TOHOKU UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Developmental Scientific Research (B)
财政年份：
1994
资助国家：
日本
起止时间：
1994 至 1995
项目状态：
已结题

项目摘要

1.Stable forms of cations of phenol complexed with hydrogen-accepting molecules such as NH_3, H_2O or p-dioxane were investigated with trapped ion photodissociation spectroscopy. Electronic spectra in the range 366-465 nm reveal that the ground-state ion of the phenol-NH_3 complex consists of a phenoxy radical and an ammonium ion, whereas other ions are complexes of phenol ions with unprotonated acceptors. Dissociation processes involving the proton transfer in the ground and the excited states of the ions are discussed.2.Electronic spectra of hydrogen-bonded complex cations of phenol with N(CH_3)_3. NH_3 and H_2O were investigated by photodissociation spectroscopy combined with a new method for the generation of jet-cooled molecular complex ions. The method involves the ionization of phenol followed by a jet expansion for the efficient formation of the complex ions as well as for the cooling. Well-resolved vibronic bands, including the bands due to intermolecular stretching vibrations, were obtained for the complex ions of phenol with N(CH_3)_3 and NH_3. Differences between the ionic and neutral forms of these complexes were discussed on the basis of the results.3.A new technique is proposed for spatially confining mass-selected ions and extracting them to a solid surface at low kinetic energy. This technique combines rf ion trapping with multiphoton ionization by a KrF excimer laser. SF_5^+ ions photodissociated from SF_6 were separated from other ionic species and stored in the cylindrical ion trap cell for at least 100ms. The stored ions were extracted onto the surface with low kinetic energies around 10eV.This technique should be useful for studying surface reactions with mass-selected, state-specified, and very-low-kinetic-energy ions and for developing etching processes that can be used to control the surface structure of semiconductors on an atomic scale.

1.用捕获离子光解离谱研究了苯酚与NH_3、H_2O、对二氧六环等吸氢分子络合时阳离子的稳定形态。在366-465 nm范围内的电子光谱表明，苯酚-NH_3络合物的基态离子由苯氧自由基和铵离子组成，而其它离子则是苯酚离子与未质子化受体的络合物。讨论了离子基态和激发态的质子转移过程。2.苯酚与N（CH_3）_3氢键配合物阳离子的电子光谱。本文采用光解离光谱技术结合一种新的喷射冷却分子络合物离子产生方法研究了NH_3和H_2O。该方法涉及苯酚的电离，然后通过射流膨胀有效地形成络合离子以及冷却。对苯酚与N（CH_3）_3和NH_3的络合离子，得到了分辨良好的电子振动带，包括分子间伸缩振动带。在此基础上讨论了离子型和中性型配合物的区别。3.提出了一种新的技术，用于空间限制质量选择离子，并在低动能下将其提取到固体表面。该技术结合了射频离子捕获与KrF准分子激光多光子电离。从SF_6中解离出的SF_5^+离子与其他离子种类分离，并在圆柱形离子阱中储存至少100 ms。该技术可用于研究质量选择、状态指定和极低动能离子的表面反应，以及开发可用于在原子尺度上控制半导体表面结构的蚀刻工艺。