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Investigations on Quantum Mechanical Properties of Liquid and Solid Helium through Spectroscopic Studies of Impurity Atoms and Molecules

通过杂质原子和分子的光谱研究研究液态和固态氦的量子力学性质

基本信息

批准号：
17340123
负责人：
MORITA Norio
金额：
$ 10.47万
依托单位：
University of Fukui
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2005
资助国家：
日本
起止时间：
2005 至 2007
项目状态：
已结题

项目摘要

It is known that an impurity atom Unpinned in superfluid liquid helium resides in a bubble-like cavity formed in the liquid, and that an alkali metal atom often forms an exciplex, such as Rb*Hen, in the bubble due to the effect of the excited valence electron in Rb*. On the contrary, it has been believed that it is difficult for an alkali earth atom to form such an exciplex because of the presence of another valence electron left in the state. However, in our previous experiment, we found that laser induced fluorescence (LIF) spectra of Mg atoms in liquid helium suggest the possibility for the formation of Mg^Hen. In the present research, to obtain a further proof for this possibility we have measured the dependence of LW spectra of Mg upon the pressure of liquid helium. Comparing the experimental spectra with the result of our theoretical calculation we have found that the spell a strongly suggest the formation of Mg^Hen exciplexes.To obtain a more definite proof for the Mg^*Hen exciplex formation mentioned above, we have measured LW spectra of Mg distributed in cold He gas at a temperature of 5 - 10K in which the gas pressure is too low for the He atoms to form any bubble-like structure around the Mg atoms. We have measured LW spectra of Mg in cold tie gas, in addition to our previous measurement for cold tie gas. Unfortunately, some trouble with the laser used for mattering Mg atoms in the die gas through laser ablation has made us to obtain the spectra less clear than for die gas, because of an insufficient number of Mg atoms. Nevertheless, also hi this observation we have successfully obtained LIF spectra peculiar to exciplex. This result has further verified the possibility for the formation of Mg*Hen exciplexes in liquid helium.

众所周知，超流液氦中未被钉扎的杂质原子存在于液体中形成的泡状空穴中，由于Rb中的激发价电子的作用，碱金属原子经常在气泡中形成激基络合物，如Rb*Hen。相反，人们一直认为碱土原子很难形成这样的激基络合物，因为还有另一个价电子留在状态中。然而，在我们之前的实验中，我们发现镁原子在液氦中的激光诱导荧光(LIF)光谱表明有形成镁氢化合物的可能性。在本研究中，为了进一步证明这种可能性，我们测量了镁的LW谱对液氦压力的依赖关系。比较实验光谱和理论计算的结果，我们发现这个拼写a强烈地暗示了镁的激基缔合物的形成。为了对上述的镁激基络合物的形成得到更明确的证据，我们测量了分布在冷氦气体中的镁的LW谱，在5-10K的温度下，气压太低，不能在镁原子周围形成气泡状结构。除了之前对冷结气体的测量外，我们还测量了镁在冷结气体中的LW光谱。不幸的是，激光烧蚀气体中的镁原子时遇到了一些问题，这使得我们无法获得比气体中的镁原子更清晰的光谱，因为镁原子的数量不足。然而，在这次观测中，我们也成功地获得了激基复合体特有的激光诱导荧光光谱。这一结果进一步证实了在液氦中形成镁-亨激基络合物的可能性。

项目成果

期刊论文数量（0）

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 hydrogens(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横截面(H_2,D_2)

DOI：
发表时间：
2006
期刊：
Journal of Physics B 39
影响因子：
0
作者：
Yoshiki;Moriwaki;Yukari;Matsuo;Yoshimitsu;Fukuyama;Norio Morita;森脇喜紀;森脇喜紀
通讯作者：
森脇喜紀

Laser spectroscopic study of Mg atoms urized liquid helium

液氦中镁原子的激光光谱研究

DOI：
发表时间：
2006
期刊：
Journal of Molecular Structure 786(In press)
影响因子：
0
作者：
Yoshiki;Moriwaki;Yukari;Matsuo;Yoshimitsu;Fukuyama;Norio Morita;森脇喜紀;森脇喜紀;森脇喜紀
通讯作者：
森脇喜紀

Laser Spectroscopic Study of Mg Atoms in Pressurized Liquid Helium

加压液氦中镁原子的激光光谱研究