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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.用俘获离子光解离光谱研究了苯酚阳离子与NH_3、H_2O或对二恶烷等氢接受分子络合的稳定形式。 366-465 nm范围内的电子光谱表明，苯酚-NH_3配合物的基态离子由苯氧基和铵离子组成，而其他离子是苯酚离子与未质子化受体的配合物。讨论了涉及基态质子转移和离子激发态的解离过程。2.苯酚与N(CH_3)_3氢键络合阳离子的电子谱。通过光解离光谱结合喷射冷却分子络离子生成新方法对NH_3和H_2O进行了研究。该方法涉及苯酚的电离，然后进行射流膨胀，以有效形成络合离子并进行冷却。苯酚与N(CH_3)_3和NH_3的络离子获得了良好分辨的电子振动谱带，包括分子间伸缩振动产生的谱带。根据结果讨论了这些配合物的离子形式和中性形式之间的差异。3.提出了一种空间限制质量选择离子并以低动能将它们提取到固体表面的新技术。该技术将射频离子捕获与 KrF 准分子激光器的多光子电离结合起来。从 SF_6 光解离的 SF_5^+ 离子与其他离子物质分离，并在圆柱形离子阱单元中存储至少 100ms。存储的离子以 10eV 左右的低动能被提取到表面上。该技术对于研究质量选择、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应该很有用。