摘要
介绍了基于原子阱的高精度放射性Kr定年系统的搭建工作。该系统可以测量ng/L水平的^(81)Kr同位素的相对丰度。为了提高测量的精度,系统采用了基于拍频锁的高稳定激光系统,通过“跳频”的方法实现了^(81)Kr同位素和参考同位素^(83)Kr测量的快速切换,抑制了由系统效率缓慢漂移带来的影响。另外,参考同位素^(83)Kr装载率通过离子电流方法精密测量,测量精度可以达到0.2‰。通过以上改进,系统单次测量标准样品^(81)Kr同位素相对丰度的精度可达2%的水平,并且相同条件下测量标准样品的结果具有可重复性。该系统结合系统误差校正将可实现高精度的^(81)Kr同位素定年应用。
An atom trap system capable of measuring the relative isotopic abundance of the ^(81)Kr isotope at a part per trillion level is developed.A beat-lock laser system is used to ensure laser frequency stability and improve measurement precision.Moreover,the trap loading rate of the reference isotope is measured precisely by applying an ion-current method.The results show that the precision and stability of a single measurement of the relative abundance of the ^(81)Kr isotope in a modern Kr sample can reach 2%.With future developments that control the systematics,this atom trap system can be used for high-precision radiokrypton dating.
作者
赵志霞
严京文
李浩
蒋蔚
卢征天
Florian Ritterbusch
杨国民
ZHAO Zhixia;YAN Jingwen;LI Hao;JIANG Wei;LU Zhengtian;FLORIAN Ritterbusch;YANG Guomin(School of Physical Science,University of Science and Technology of China,Hefei 230026,Anhui,China;CAS Center for Excellence in Quantum Information and Quantum Physics,Chinese Academy of Sciences,Hefei 230026,Anhui,China;Hefei National Laboratory for Physical Sciences at the Microscale,University of Science and Technology of China,Hefei 230026,Anhui,China)
出处
《地球化学》
CAS
CSCD
北大核心
2022年第5期611-616,共6页
Geochimica
基金
科技部国家重点研发计划(2016YFA0302200)
国家自然科学基金委国家重大科研仪器研制项目(41727901)
安徽省量子通信与量子计算机重大项目引导性项目(AHY110000)联合资助。
