权益分类	功能权益	普通用户	{{item.name}}会员
{{category.name}}	{{benefitItem.name}}

Collision processes of singly and multiply charged ions in cold helium gas

冷氦气中单电荷和多电荷离子的碰撞过程

基本信息

批准号：
15540388
负责人：
MATSUO Yukari
金额：
$ 2.05万
依托单位：
RIKEN
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

项目摘要

We are aiming at studying electronic energy transfer of singly and multiply charged ions in collision with cold helium gas at 3-300K. Although pair-potentials between helium atom and other atomic species are relatively well known among other interatomic potentials, experimental studies of collisions between cold helium atoms and other atoms are scarce. Moreover, only a few collision cross sections are measured for the combination of helium atom and atomic ions even at room temperature. This is presumably because of the difficulty of producing atomic ions in the environment of cold helium gas. In order to solve the problem, we applied laser ablation technique to a solid sample in cold helium gas to produce atomic ions and detected them with laser-spectroscopic method. The results will leads to the information on interatomic potentials between ions and atoms.Produced ions are excited to the electronically excited state with a tunable dye laser, then both laser-induced fluorescence (LIF) from ions in the excited state and sensitized fluorescence (SF) from ions in the state to which ions are transferred by collision with helium atoms are observed simultaneously. This procedure makes it possible to determine collision cross sections of ions and cold helium atoms. In particular, alkali-earth ions such as Ba^+ reveal fascinating character of forming molecules called exciplex (e.g. Ba^<+*>-He) in high density cold helium gas due to the three-body collision of excited ions and two helium atoms. Another two-body collision process of such exciplex and helium atoms results in dissociation of Ba^<+*>-He into Ba^+ ion and helium atom. We have clarified a peculiar temperature dependence of cross sections caused by two- and three-body collisions at temperature 3-30 K for the first time.

我们的目标是研究在3-300K低温氦气下，单带电离子和多带电离子碰撞时的电子能量传递。虽然在其他原子间势中，氦原子与其他原子之间的对势是比较为人所知的，但冷氦原子与其他原子之间碰撞的实验研究却很少。此外，即使在室温下，氦原子与原子离子结合的碰撞截面也只测量到少数。这可能是因为在冷氦气的环境中很难产生原子离子。为了解决这一问题，我们将激光烧蚀技术应用于固体样品在冷氦气中产生原子离子，并用激光光谱法对其进行检测。结果将导致离子和原子之间的原子间电位的信息。用可调谐染料激光器将离子激发到电子激发态，同时观察激发态离子的激光诱导荧光（LIF）和离子与氦原子碰撞转移状态离子的致敏荧光（SF）。这个过程使得确定离子和冷氦原子的碰撞截面成为可能。特别是，碱土离子，如Ba^+，在高密度冷氦气中，由于激发态离子和两个氦原子的三体碰撞，显示出形成激络合物分子的迷人特征（如Ba^<+*>-He）。Ba^<+*>-He解离为Ba^+离子和氦原子。我们首次阐明了在3- 30k温度下，由二体和三体碰撞引起的截面的特殊温度依赖性。

项目成果

期刊论文数量（37）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Long electronic spin relaxation time of Cs atoms in superfluid helium

超流氦中 Cs 原子的长电子自旋弛豫时间

DOI：
发表时间：
2005
期刊：
RIKEN Accel.Prog.Rep. 38(in press)
影响因子：
0
作者：
Y.Fukuyama;Y.Matsuo;A.Hatakeyama;Y.Fukuyama;T.Kobayashi他
通讯作者：
T.Kobayashi他

LIF observation of neutral atoms and ions produced by femtosecond laser ablation of Sm on a substrate

LIF 观察飞秒激光烧蚀基底上的 Sm 产生的中性原子和离子

DOI：
发表时间：
期刊：
Journal of Physics : Conference Series "The 8th International Conference on Laser Ablation" (in press)
影响因子：
0
作者：
Y.Matsuo
通讯作者：
Y.Matsuo

Dependence of femtosecond laser ablation for organic molecules on chosen substrate

飞秒激光烧蚀有机分子对所选基材的依赖性

DOI：
发表时间：
期刊：
Journal of Physics : Conference Series "The 8th International Conference on Laser Ablation" (in press)
影响因子：
0
作者：
Hisao Hayakawa;Atushi Kawarada;M.Kurata-Nishimura
通讯作者：
M.Kurata-Nishimura

Electron-spin polarization of photoions produced through photoionization from the laser-excited triplet state of Sr

激光激发 Sr 三重态光电离产生光电离的电子自旋极化

DOI：
发表时间：
2004
期刊：
J.Chem.Phys. 120-4
影响因子：
0
作者：
Tadanori Koga;Mikihito Takenaka;Kazuya Aizawa;Masao Nakamura;Takeji Hashimoto;Mikihito Takenaka et al.;Mikihito Takenaka;Mikihito Takenaka;海野徳仁;堀修一郎;Shuichiro HORI;三浦英俊;T.Furukawa;N.Yonekura;松尾由賀利;N.Yonekura
通讯作者：
N.Yonekura

Dependence of femtosecond laser adlation for organic molecules on chosen substrate

飞秒激光对有机分子进行修饰对所选基底的依赖性