Loading of mass spectrometry ion trap with Th ions by laser ablation for nuclear frequency standard application
Loading of mass spectrometry ion trap with Th ions by laser ablation for nuclear frequency standard application
复制标题
通过激光烧蚀装载 Th 离子的质谱离子阱，用于核频率标准应用
DOI：
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发表时间：
2017
影响因子：
1.3
通讯作者：
V. Yudin
中科院分区：
文献类型：
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作者：
P. V. Borisyuk;S. Derevyashkin;K. Khabarova;N. Kolachevsky;Y. Lebedinsky;S. Poteshin;A. Sysoev;E. V. Tkalya;D. Tregubov;V. I. Troyan;O. Vasiliev;V. Yakovlev;V. Yudin
基于钍核独特的同质异能态跃迁，提出了一种新颖的多段四极离子阱，旨在实现核频标。结果表明，该系统对激光烧蚀金属钍靶产生的Th ~+、Th ~（2+）和Th ~（3+）离子具有良好的作用效果。用于烧蚀的激光强度为约6 GW/cm 2。通过向包括RF电压在内的每个控制电压施加偏置电势，我们不仅能够在宽至1-500 eV的能量范围内操纵离子，而且能够专门调节捕获电势，以便主要与属于能量分布最大值的离子一起工作，从而有效地增加捕获离子的数量。通过测量激光烧蚀获得的~（232）Th ~+、~（232）Th ~（2+）、~（232）Th ~（3+）离子的能量分布，确定了俘获过程的最佳势函数值。观察到的离子数内的陷阱依赖于捕获时间被发现服从一个不寻常的慢对数衰减规律，需要更仔细的研究。
We describe an original multisectional quadrupole ion trap aimed to realize nuclear frequency standard based on the unique isomer transition in thorium nucleus. It is shown that the system effectively operates on Th+, Th2+ and Th3+ ions produced by laser ablation of metallic thorium-232 target. Laser intensity used for ablation is about 6 GW/cm2. Via applying a bias potential to every control voltage including the RF one, we are able not only to manipulate ions within the energy range as wide as 1–500 eV but to specially adjust trap potentials in order to work mainly with ions that belong to energy distribution maximum and therefore to effectively enhance the number of trapped ions. Measurement of energy distributions of 232Th+, 232Th2+, 232Th3+ ions obtained by laser ablation allows us to define optimal potential values for trapping process. Observed number of ions inside trap in dependence on trapping time is found to obey an unusually slow – logarithmic decay law that needs more careful study.