Spectroscopic Study of Reaction Dynamics in Quantum Solids.
量子固体反应动力学的光谱研究。
基本信息
- 批准号:10206203
- 负责人:
- 金额:$ 15.3万
- 依托单位:
- 依托单位国家:日本
- 项目类别:Grant-in-Aid for Scientific Research on Priority Areas (B)
- 财政年份:1998
- 资助国家:日本
- 起止时间:1998 至 2000
- 项目状态:已结题
- 来源:
- 关键词:
项目摘要
Solid hydrogen, known as a quantum crystal, shows extremely narrow spectral linewidths, which allow us to study interactions and dynamics of molecules imbedded in the solid by high-resolution spectroscopy. In order to study quantum effects on dynamics of molecules, we have investigated excited states and its relaxation processes, and chemical reactivities of molecules imbedded in solid parahydrogen using high-resolution rotation-vibration spectroscopy. Main results we obtained are as follows.(1) Relaxation processes of electronic and vibrational excited states in quantum solid.We found a T^4 temperature dependence of pure dephasing of vibrational excited states of molecules imbedded in the quantum solid. The T^4 temperature dependence is intrinsically different from the T^7 temperature dependence in classical medium. We also found that nuclear spin relaxation in the quantum solid is mainly caused by the intramolecular nuclear spin-rotation interaction and the one-phonon lattice rotation interaction.(2)Ions in quantum solid.In order to study ions in quantum solids, we irradiated solid hydrogen by gamma-ray. The irradiated solid showed new complicated spectral features with extremely narrow spectral linewidths. These spectral features are attributed to the transitions of hydrogen molecules induced by electric fields of ions produced in the solid.(3) Quantum effects on tunneling reaction.We have investigated X+H_2→XH+H type tunneling reaction in solid hydrogen by infrared spectroscopy. The tunneling reaction rate depends drastically on the zero-point vibration of reactants and products. Moreover, the rate depends significantly on the vibrational quantum number of reactants.
固体氢,被称为量子晶体,显示出极窄的光谱线宽,这使我们能够通过高分辨率光谱学研究嵌入固体中的分子的相互作用和动力学。为了研究量子效应对分子动力学的影响,我们利用高分辨旋转振动光谱研究了固体仲氢中分子的激发态及其弛豫过程,以及分子的化学反应性。主要结果如下。(1)量子固体中电子和振动激发态的弛豫过程。我们发现嵌入量子固体中的分子振动激发态的纯退相与T^4温度相关。在经典介质中,T^4的温度依赖性与T^7的温度依赖性本质上是不同的。我们还发现量子固体中的核自旋弛豫主要是由分子内核自旋-转动相互作用和单声子晶格转动相互作用引起的。(2)量子固体中的离子:为了研究量子固体中的离子,我们用γ射线辐照固体氢。辐照后的固体显示出新的复杂光谱特征,具有极窄的光谱线宽。这些光谱特征归因于固体中产生的离子的电场诱导的氢分子的跃迁。(3)隧穿反应的量子效应用红外光谱研究了固体氢中X+H_2→XH+H型隧穿反应。隧穿反应速率与反应物和产物的零点振动密切相关。此外,该速率显著依赖于反应物的振动量子数。
项目成果
期刊论文数量(30)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
H.Katsuki, T.Momose: "Observation of Rovibrational Dephasing of Molecules in Parahydrogen Crystals"Physical Review Letters. 84(15). 3286-3289 (2000)
H.Katsuki、T.Momose:“仲氢晶体中分子旋转相移的观察”物理评论快报。
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- 影响因子:0
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M.Fushitani, T.Wakabayashi, T.Momose, T.Shida: "Photoinduced Reactions of Methyl Radical in Solid Parahydrogen"Journal of Chemical Physics. 109(15). 6346-6350 (1998)
M.Fushitani、T.Wakabayashi、T.Momose、T.Shida:“固体仲氢中甲基自由基的光诱导反应”化学物理杂志。
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T.Momose, H.Hoshina, N.Sogoshi, H.Katsuki, T.Shida: "Tunneling Chemical Reactions in Solid Parahydrogen : A Case of CD_3+H_2→CD_3H+H at 5 K"Journal of Chemical Physics. 108(17). 7334-7338 (1998)
T.Momose、H.Hoshina、N.Sogoshi、H.Katsuki、T.Shida:“固体仲氢中的隧道化学反应:5 K 下 CD_3+H_2→CD_3H+H 的案例”化学物理杂志 108(17)。 )7334-7338(1998)。
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M.Miki, T.Momose: "Rovibrational Transitions and Nuclear Spin Conversion of Methane in Parahydrogen Crystals"Low Temperature Physics. 26(9/10). 661-668 (2000)
M.Miki、T.Momose:“仲氢晶体中甲烷的振动跃迁和核自旋转换”低温物理学。
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Takamasa Momose,C.Michael Lindsay,Yu Zhang, and Takeshi Oka: "Sharp Spectral Lines Observed in γ-ray Ionized Parahydrogen Crystals"Phys. Rev. Lett. 86(21). 4795-4798 (2001)
Takamasa Momose、C.Michael Lindsay、Yu Zhu 和 Takeshi Oka:“在 γ 射线电离仲氢晶体中观察到的锐谱线”Phys. Rev. 4795-4798 (2001)。
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MOMOSE Takamasa其他文献
MOMOSE Takamasa的其他文献
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{{ truncateString('MOMOSE Takamasa', 18)}}的其他基金
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 - 财政年份:2002
- 资助金额:
$ 15.3万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Ultra-High-Resolution Spectroscopy of Solid Hydrogen
固体氢的超高分辨率光谱
- 批准号:
11694073 - 财政年份:1999
- 资助金额:
$ 15.3万 - 项目类别:
Grant-in-Aid for Scientific Research (B)
Uilta high resolution spectroscopy of excitons in quantum crystal
量子晶体中激子的 Uilta 高分辨率光谱
- 批准号:
09304040 - 财政年份:1997
- 资助金额:
$ 15.3万 - 项目类别:
Grant-in-Aid for Scientific Research (A)
Ultra High Resolution Spectroscopy of Solid Parahydrogen.
固体仲氢的超高分辨率光谱。
- 批准号:
09044077 - 财政年份:1996
- 资助金额:
$ 15.3万 - 项目类别:
Grant-in-Aid for international Scientific Research
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