Development of new techniques for the study of chemical reactions using superfluid He droplets

开发利用超流氦液滴研究化学反应的新技术

• 批准号: 14340182
• 负责人: MOMOSE Takamasa
• 金额: $ 10.56万
• 依托单位: Kyoto University
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2004
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340182/
• 关键词: superfluid He; low temperatures; low temperature chemistry; high-resolution spectroscopy; quantum condensed phases; tunneling chemical reactions; droplets; 液体ヘリウム; 超流動; マトリックス分光法; LIF; 化学反応; 超流動液滴; ヘリウム; 高分子; 高分解能分; 生体分子; パルスノズル; 誘導ラマン

In the present project, we intended to develop new techniques for the study of low temperature chemical reactions using superfluid He droplets. Superfluid He droplets are the clusters of He atoms, that possesses superfluid properties. It has been shown that one can easily trap molecules in He droplets, and perform high-resolution spectroscopy of free rotation in the droplets. The environment of He droplets does not perturb the embedded molecule significantly, so that the energy levels and other properties of the embedded molecule are almost the same as those of free molecules. Since the temperature of the droplets is 0.4 K, He droplets must be a unique system for the study of chemical reactions of molecules at low temperatures. In order to apply the technique of He droplets to the study of low temperature chemical reactions, we have developed a pulsed nozzle of He droplet as well as a new laser system that produces intense IR pulses during the period of this project. In addition, we have measured high-resolution LIF spectra of Phthalocyanine and its van der Waals clusters with Ne,Ar,N_2, and H_2. We could control the size of the van der Waals clusters around Phthalocyanine precisely. The success of the observation of the van der Waals clusters indicates that the technique of He droplets is useful not only for the study of chemical reactions, but also for controling chemical reactions by adjustiong the size of van der Waals clusters.

在本项目中，我们打算开发利用超流氦液滴研究低温化学反应的新技术。超流He液滴是He原子的簇，具有超流特性。研究表明，人们可以轻松地将分子捕获在He液滴中，并对液滴中的自由旋转进行高分辨率光谱分析。 He液滴的环境不会显着扰动嵌入分子，因此嵌入分子的能级和其他性质几乎与自由分子相同。由于液滴的温度为 0.4 K，He 液滴必定是研究低温下分子化学反应的独特系统。为了将He液滴技术应用于低温化学反应的研究，我们在该项目期间开发了He液滴脉冲喷嘴以及产生强红外脉冲的新型激光系统。此外，我们还测量了酞菁及其范德华簇与Ne、Ar、N_2和H_2的高分辨率LIF光谱。我们可以精确控制酞菁周围范德华簇的大小。范德华团簇观测的成功表明，He液滴技术不仅可用于化学反应的研究，而且还可用于通过调节范德华团簇的尺寸来控制化学反应。

项目成果

Nuclear Spin Selection Rule in the Photochemical Reaction of CH_3 in Solid Parahydrogen

固体仲氢中CH_3光化学反应的核自旋选择规律

• 发表时间: 2002
• 期刊: J.Chem.Phys. 116(24)
• 作者: M.Fushitani;T.Momose
• 通讯作者: T.Momose

M.Fushitani: "Generation of Infrared Radiation by Stimulated Raman Scattering in Para-Hydrogen Crystal at 5K"Opt.Lett.. 28(1). 37-39 (2003)

M.Fushitani：“5K 仲氢晶体中受激拉曼散射产生红外辐射”Opt.Lett.. 28(1)。

Solid Hydrogen Raman Laser for Mid Infrared Range (4.4-8μm)

中红外范围固体氢拉曼激光器 (4.4-8μm)

• 发表时间: 2004
• 期刊: Appl.Opt. 43(32)
• 作者: K.Kujyanovs;T.Momose;A.F.Vilesov
• 通讯作者: A.F.Vilesov

Mikhail N.Slipchenko: "Intense Pulsed Helium Droplet Beams"Rev.Sci.Instru.. 73・10. 3600-1605 (2002)

Mikhail N.Slipchenko：“强脉冲氦液滴束”Rev.Sci.Instru.. 73・10（2002）。

Stimulated Stokes Downconversion in Liquid and Solid Parahydrogen

液体和固体仲氢中的受激斯托克斯下转换

• 发表时间: 2003
• 期刊: Opt.Lett. 28(1)
• 作者: B.J.McCall;A.J.Huneycutt;R.J.Saykally;C.M.Lindsay;T.Oka;M.Fushitani;Y.Miyamoto;T.Momose
• 通讯作者: T.Momose