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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.

已知超流液氦中未钉扎的杂质原子驻留在液体中形成的气泡状空腔中，并且由于Rb*中激发的价电子的作用，碱金属原子常常在气泡中形成激基复合物，例如Rb*Hen。相反，人们认为碱土原子很难形成这样的激基复合物，因为存在处于该状态的另一个价电子。然而，在我们之前的实验中，我们发现液氦中 Mg 原子的激光诱导荧光 (LIF) 光谱表明了 Mg^Hen 形成的可能性。在目前的研究中，为了进一步证明这种可能性，我们测量了镁的长波谱对液氦压力的依赖性。将实验光谱与我们的理论计算结果进行比较，我们发现拼写a强烈暗示了Mg^Hen激基复合物的形成。为了获得上述Mg^*Hen激基复合物形成的更明确的证明，我们测量了分布在5-10K冷He气体中的Mg的长波光谱，其中气体压力太低，He原子无法在Mg原子周围形成任何气泡状结构。除了之前对冷联系气体的测量外，我们还测量了冷联系气体中镁的长波谱。不幸的是，由于镁原子数量不足，用于通过激光烧蚀分析模具气体中镁原子的激光存在一些问题，使得我们获得的光谱不如模具气体清晰。然而，在这次观察中，我们也成功地获得了激基复合物特有的LIF光谱。这一结果进一步验证了液氦中形成Mg*Hen激基复合物的可能性。

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