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Vibrational Dynamics of Mass-Selected Ion Clusters as Studied by Double Resonance Laser Spectroscopy

双共振激光光谱研究质量选择离子簇的振动动力学

基本信息

批准号：
05453016
负责人：
YAMANOUCHI Kaoru
金额：
$ 4.8万
依托单位：
The University of Tokyo
依托单位国家：
日本
项目类别：
Grant-in-Aid for General Scientific Research (B)
财政年份：
1993
资助国家：
日本
起止时间：
1993 至 1994
项目状态：
已结题

项目摘要

During the fiscal years of 1993 and 1994, I obtained the following results :(1) Excitation spectra for the transitions to the series of Rydberg states of Hg-rare gas type van der Waals clusters, HgNe and HgAr, were measured for the firast time by optical-optical laser double resonance (OODR) spectroscopy. Based on high-resolution measurements, isotope species of ^<200>HgNe and ^<202>HgNe were observed separately free from congestion by other less-abundant isotopic species of ^mHgNe (m=198,199,201, and 204) by using a well-split ro-vibronic transition to the A^30^+ state, which is an intermediate state for the double resonance scheme. Using the observed mass-selected OODR spectra, interatomic potentials of the s-and d-Rydberg series were detemined systematically.(2) It was found that the interatomic potential of the s-Rydberg state at a principal quantum number, n, of n=7 exhibits characteristic shape with a potential barrier. In order to interpret the potential function, an analysis using a quantum defect orbital was performed, and a potential model, representing well the n-dependence of the interatomic potential, was proposed. The potential model clearly showed that the n-dependence is principally govermed by an exchange interaction between a Rydberg electron and a rare gas atom attached to Hg. It was also shown that (i) inter atomic potentials of triplet and singlet electronic state are slightly different from each other for the same n and (ii) a triplet potential is always deeper than a singlet potential for the same n. This finding of the difference between the singlet and triplet states was interpreted for the first time by a super-exchange interaction. Furthermore, rates of the predissociation processes in the Rydberg states were also determined from the line-broadening of the high-resolution OODR spectra.

在1993和1994财政年度，我获得了以下结果：(1)首次用光学-光学激光双共振（OODR）光谱法测量了氢稀有气体型范德华星团HgNe和HgAr向里德堡态系列跃迁的激发光谱。在高分辨率测量的基础上，我们分别观测到^<200>HgNe和^<202>HgNe的同位素种，它们没有被^mHgNe的其他同位素种（m=198,199,201和204）所阻塞，并利用良好分裂的反振动跃迁到双共振方案的中间态a ^30^+态。利用观测到的质量选择OODR光谱，系统地确定了- d-Rydberg系列的原子间电位。(2)发现主量子数n为n=7时s-Rydberg态的原子间势表现出具有势垒的特征形状。为了解释势函数，利用量子缺陷轨道进行了分析，并提出了一个能很好地表示原子间势的n依赖性的势模型。潜力模型清楚地表明,n-dependence由交换之间的交互主要govermed里德伯电子和稀有气体原子Hg。这也表明,(i)国米三联体和单线态电子态的原子势略不同相同的n和(2)一个三联体潜在的潜力总是比单线态相同的n。这一发现的单线态和三线态之间的差异解释了第一次通过超级交换相互作用。此外，还通过高分辨率OODR光谱的谱线展宽确定了Rydberg态预解离过程的速率。