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，我们改进了我们的实验装置。该装置已能进行激光诱导荧光实验，经过改进后，还能进行激光电离实验。利用这种改进的装置，我们试图观察吸附的分子，如CO，CN等，在Mg、Al和Si等轻金属表面上的吸附光谱，并成功地测量了一些新的分子吸附体系的新光谱。通过对观测光谱的分析，我们获得了一些关于吸附物种内转动运动的新信息。本项目的研究结果将为控制吸附表面上的吸附分子提供有用的指导。仪器通过本研究预算对我们的实验装置进行改进后，它可以进行激光电离实验，这比我们现有的激光诱导荧光方法更高的灵敏度，并且使用这种新技术，我们成功地观察到了新的分子吸附系统，实验结果我们成功地观察到了SiCCH、SiCN和SiNC等硅团簇系统。发现SiCN/SiNC体系中CN物种的内旋转运动具有相当复杂的机理。对于Al和Ng体系，我们分析了一些内旋转运动势，清楚地表明该势对分子吸附体系有很强的依赖性。结果表明，MgOH体系的电势以4阶非谐项为主，MgNC/MgCN体系的电势可用三角函数描述.

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

The ν2 Bending Vibrational Structure of the X2Σ+ State of MgNC

MgNC X2Σ+态的ν2弯曲振动结构

• DOI: 10.1063/1.3640024
• 发表时间: 2011
• 期刊: Journal of Chemical Physics
• 影响因子: 4.4
• 作者: K. Kanda;S. Yamanaka;T. Saito;T. Kawakami;Y. Kitagawa;M. Okumura;H. Nakamura;K. Yamaguchi;A. Inaba;Motoko S. Asano;Masaru Fukushima and Takashi Ishiwata
• 通讯作者: Masaru Fukushima and Takashi Ishiwata