Recombination measurements at low energies with Au49+,50+,51+ at the TSR
Recombination measurements at low energies with Au49+,50+,51+ at the TSR
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在 TSR 处使用 Au49 ,50 ,51 进行低能量复合测量
DOI：
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发表时间：
1997
期刊：
影响因子：
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通讯作者：
D. Savin
中科院分区：
文献类型：
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作者：
O. Uwira;A. Müller;J. Linkemann;T. Bartsch;C. Brandau;M. Schmitt;A. Wolf;D. Schwalm;R. Schuch;W. Zong;H. Lebius;W. Graham;J. Doerfert;D. Savin
在TSR上研究了Au ~（49+）、Au ~（50+）和Au ~（51+）离子的还原。与Au 50+离子的存储寿命只有2至4秒，观察到与磁膨胀的电子束的冷却器在一个密度的ne = 107 cm-3。这种短的存储时间是原子离子所观察到的最高复合速率系数的结果（在电子和离子之间的零相对能量Erel = 0时为1.8·10-6 cm 3 s-1）。在约30 meV的一个巨大的双电子复合共振被发现与记录的小宽度只有约15 meV。这种共振偶然发生在Erel=0附近，可能是与Au 50+，Pb 53+（在LEAR最近的实验中）以及其他络合物离子观察到的增强复合率的主要原因。Au ~（49+）和Au ~（51+）的复合率要小一个数量级。
Recombination of Au49+, Au50+, and Au51+ ions has been studied at the TSR. With Au50+ ions a storage lifetime of only 2 to 4 s was observed with the magnetically expanded electron beam of the cooler at a density of ne = 107 cm-3. This short storage time is a consequence of the highest recombination rate coefficient ever observed with an atomic ion (1.8·10-6 cm3 s-1 at zero relative energy Erel = 0 between electrons and ions). At about 30 meV a huge dielectronic recombination resonance is found with a record small width of only about 15 meV. Such resonances fortuitously occurring near Erel=0 are probably the main reason for the enhanced recombination rates observed with Au50+, with Pb53+ (in a recent experiment at LEAR) as well as with other complex ions. For Au49+ and Au51+ the recombination rates are smaller by an order of magnitude.