Direct Observation of Internal Rotational Motion of Molecules Absorbed on a Surfaces

直接观察表面吸附分子的内部旋转运动

• 批准号: 16510078
• 负责人: FUKUSHIMA Masaru
• 金额: $ 2.18万
• 依托单位: Hiroshima City University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2004
• 资助国家: 日本
• 起止时间: 2004 至 2005
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-16510078/
• 关键词: Silicon cluster; Supersonic Free Jet Expansion; Laser induced fluorescence; Internal rotation potential; Laser ablation; SiCN; SiNC; レーザーアプレーション

On this research project, we have improved our experimental apparatus. The apparatus had been already enable to carried out the laser induced fluorescence experiments, and, after the present improvements, the laser ionization experiments could also be performed on this apparatus. Using this improved apparatus, we tried to observe adsorbed molecules, such as CO,CN, etc., on light metal surfaces, such as, Mg, Al, and Si, and we have succeeded to measure new spectra of some new molecular adsorbed systems. From the analysis of the observed spectra, we have obtained some new information on the internal rotational motion of the adsorbed species. The results of this project would provide useful guide to control of adsorbed molecules on the adsorbed surfaces.ApparatusAfter the improvements on our experimental apparatus executed by this research budget, it could perform the laser ionization experiments, which is higher sensitivity than the laser induced fluorescence method that we had, and using this new technique, we succeeded to observe new molecular adsorbed systems, because of the higher sensitivity.Experimental resultsWe succeeded to observe Si cluster systems, such as SiCCH, SiCN, and SiNC. It is found for the SiCN/SiNC system that the internal rotation motion of the CN species has quite complicated mechanism. For the Al and Ng systems, we analyzed some internal rotation motion potentials, and clearly showed that the potential has quite strong dependence upon the molecular adsorbed system. It was found that the 4th order anharmonic term is predominant for the potential of the MgOH system, and that the potential can be well described by the trigonometrical function for the MgNC/MgCN system.

在这个研究项目中，我们改善了我们的实验设备。该设备已经可以进行激光诱导的荧光实验，并且在当前改进之后，也可以在该设备上进行激光电离实验。使用这种改进的设备，我们试图在轻质金属表面上观察到吸附的分子，例如CO，CN等，例如，Mg，Al和Si，我们成功地测量了一些新的分子吸附系统的新光谱。从观察到的光谱的分析中，我们获得了有关吸附物种内部旋转运动的一些新信息。该项目的结果将提供有用的指南，以控制吸附的表面上的吸附分子。按照这项研究预算执行的实验设备的改进，它可以执行激光离子化实验，这比我们已经使用了新技术的激光诱导的荧光方法更高，因为我们已经使用了新的技术，因为我们的新技术更高，因为我们的新技术，因为我们的新技术，因为它是新的，因为它是新的，因为它是新的，因为它是新的，因为它是新的，因为它是新的，因为它是新的，因为我们的新技术是有效的。敏感性。经验性结果成功地观察了SICH，SICN和SINC等SI群集系统。对于SICN/SINC系统发现，CN物种的内部旋转运动具有相当复杂的机制。对于AL和NG系统，我们分析了一些内部旋转运动电位，并清楚地表明，该电位对分子吸附系统具有很强的依赖性。已经发现，第四阶非谐波项主要是MGOH系统电位，并且可以通过MGNC/MGCN系统的三角函数来很好地描述电势。

项目成果

The v_2 Bending Vibrational Structure of the X^2Σ^+ State of MgNC

MgNC X^2Σ^+态的v_2弯曲振动结构

• 期刊: Journal of Physical Chemistry A (in press)
• 作者: Masaru Fukushima;Takashi Ishiwata
• 通讯作者: Takashi Ishiwata

The Low-lying Bending Vibronic Bands of the MgNC A^2Π State

MgNC A^2Π态的低洼弯曲电子能带

• 期刊: Journal of Chemical Physics (in press)
• 作者: Masaru Fukushima;Takashi Ishiwata
• 通讯作者: Takashi Ishiwata