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.用捕获的离子光解离光谱法研究了与氢气分子（例如NH_3，H_2O或P-二恶烷）络合的稳定形式的阳离子。 366-465 nm范围内的电子光谱表明，苯酚-NH_3复合物的地下离子由酚类自由基和铵离子组成，而其他离子是苯酚离子的复合物，具有未塑料的受体。讨论了涉及地面质子转移和离子激发态的解离过程。2。苯酚与N（CH_3）_3的氢键复合阳离子的电谱。 NH_3和H_2O通过光解相结合光谱法与一种新方法生成喷气冷的分子复合离子相结合研究。该方法涉及苯酚的电离，然后是射流膨胀，以有效地形成复合离子和冷却。对于苯酚与N（CH_3）_3和NH_3的复合离子，获得了完善的振动带，包括由于分子间拉伸振动引起的带。根据结果讨论了这些复合物的离子和中性形式之间的差异。3。提出了一种新技术，用于在空间上限制质量选择的离子，并将它们提取到低动能下的固体表面。该技术将RF离子捕获与KRF准分子激光器的多光子离子化结合在一起。 SF_5^+离子从SF_6分离出与其他离子物种分离，并在圆柱体离子陷阱细胞中储存至少100ms。将存储的离子用低的动能在10ev左右提取到表面上。该技术对于使用质量选择，状态指定和非常低的运动能源离子研究表面反应有用用于控制原子尺度上半导体的表面结构。