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Laser spectroscopic study of formation of alkali-earth and He van der Waals molecules

碱土和范德华分子形成的激光光谱研究

基本信息

批准号：
17550008
负责人：
MORIWAKI Yoshiki
金额：
$ 2.3万
依托单位：
University of Toyama
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2006
项目状态：
已结题

项目摘要

1. Spectroscopic study of alkali-earth atom - He collision dynamics in low temperature(1) Formation of Mg^<*4>He_n exciplex in low temperatureWe have observed the formation of ^<*4>MgHe_n exciplexes by means of laser excitation of Mg into the 3s3p ^1P_1 state in low temperature He gas (5-30K). Emission spectra have been analyzed using a theoretical pair potential. Exciplexes grow in many three-body reactions within its lifetime in the electronic excited state. Finally up to ten He atoms are attached around to a Mg atom to form a Mg*He_<10>. We have also observed almost the same results for Mg_<-3>He collisions. In this research, we have shown that the Mg*Hen molecules are formed although attractive interaction energy between Mg and He is small.(2) Collision dynamics of Ba^<+>-HeWe have investigated the relaxation process of Ba+ in the 6p ^2P_<3/2> state in collision with He atoms using laser spectroscopic method. We have obtained the rate constants of the formation and dissociation of Ba+*He, and the fine structure changing collision of Ba+ and Ba+*He. The resonance like structure observed in the cross section of the formation of Ba+*He exciplex indicates the two-step Lindemann mechanism. We have also observed a peculiar increase in the cross section of the fine-structure changing collision at the low temperature. This indicates another channel of the fine-structure change opens in the low temperature.2. Fine-structure changing collision of alkali-earth ionWe have measured the fine-structure changing collision cross sections of alkali-earth ions at room temperature in collision with He, H_2 and D_2. We have found that cross sections for collisions with He atoms decrease exponentially with the fine-structure splitting, which can be explained by the Landau-Zener model of the adiabatic transition. In contrast to this, cross sections for hydrogen molecules are much enlarged due to resonance between the fine-structure splitting and the rotation of hydrogen molecule.

1.低温下碱土金属原子与He碰撞动力学的光谱研究（1）低温下Mg^<*4>He_n激基复合物的形成在低温He气体中（5- 30 K），用激光激发Mg进入3s3p^1P_1态，观察到了^<*4>MgHe_n激基复合物的形成。发射光谱已被分析使用的理论对潜在的。激基复合物在电子激发态的寿命内在许多三体反应中生长。最后，多达10个He原子附接在Mg原子周围以形成Mg*He_<10>。在Mg_ He碰撞中也观察到了几乎相同的结果<-3>。在这项研究中，我们已经表明，Mg*Hen分子的形成，虽然Mg和He之间的吸引相互作用能很小。(2)Ba^+-He碰撞动力学我们用激光光谱方法研究了Ba ~+6p^2P_<3/2>态与He原子碰撞的弛豫过程。得到了Ba ~+·He的生成和解离速率常数以及Ba ~+和Ba ~+·He碰撞的精细结构变化。在Ba ~+*He激基复合物形成截面上观察到的类共振结构表明了两步Lindemann机理。我们还观察到在低温下精细结构变化碰撞截面的特殊增加。这表明在低温条件下打开了另一条精细结构变化的通道.我们测量了室温下碱土金属离子与He、H_2和D_2碰撞的精细结构变化碰撞截面。我们发现，与He原子的碰撞截面随精细结构分裂呈指数下降，这可以用绝热跃迁的Landau-Zener模型来解释。与此相反，由于氢分子精细结构的分裂和旋转之间的共振，氢分子的横截面大大增大。

项目成果

期刊论文数量（14）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Laser spectroscopic measurements of fine-structure changing cross sections of alkali earth ions in collisions with molecular hydrogen(H_2, D_2)

激光光谱测量碱土离子与氢分子碰撞时精细结构变化的截面(H_2,D_2)

DOI：
发表时间：
2006
期刊：
J. Phys. B 39
影响因子：
0
作者：
Yoshiki Moriwaki;Yukari Matsuo;Yoshimitsu Fukuyama;Norio Morita
通讯作者：
Norio Morita

Temperature and Pressure Control of Cold Helium Gas above Liquid Helium for Laser Spectroscopy of Atoms and Molecules at 3-30 K

液氦上方冷氦气的温度和压力控制，用于 3-30 K 原子和分子激光光谱分析

DOI：
发表时间：
期刊：
AIP Conference Proceedings series (in press)
影响因子：
0
作者：
Satoshi Noda;Akinori Baba;Tamiki Komatsuzaki;Y.Matsuo
通讯作者：
Y.Matsuo

Fine structure changing cross section of Ba^+ ions in collisions with He atoms

精细结构改变 Ba^ 离子与 He 原子碰撞时的横截面

DOI：
发表时间：
2008
期刊：
Japanese Journal of Applied Physics 47
影响因子：
0
作者：
青木茂;深町康;若土正曉;他5名;森脇喜紀
通讯作者：
森脇喜紀

International Seminar on Progress and Excitement in AMO Physics

AMO物理学进展与兴奋国际研讨会

DOI：
发表时间：
2006
期刊：
影响因子：
0
作者：
森脇喜紀;小林かおり;松島房和;森田紀夫;Laser Spectroscopic Study of Impurity Atoms Implanted in Liquid ^4He and ^3He
通讯作者：
Laser Spectroscopic Study of Impurity Atoms Implanted in Liquid ^4He and ^3He

Fine structure changing cross section of Ba+ ions in collisions with He atoms

精细结构改变 Ba 离子与 He 原子碰撞时的横截面