Development of an ultralow background mass spectrometer for isotope analysis of noble gas atoms using delayed ionization via the metastable state

为了降低共振电离质谱法应用于快堆故障燃料检测和定位系统的背景，我们开发了一种通过亚稳态延迟电离氪和氙同位素的方法。利用长波长激光进行延迟电离，成功地消除了氩气和氩气二聚体电离对光电子产生的背景的影响，与使用短波紫外激光的传统技术相比，电离效率约为10%。

To reduce background in resonance ionization mass spectrometry applied for the failed fuel detection and location system of fast reactors, we developed a method of delayed ionization of krypton and xenon isotopes via the metastable states. With the use of a long wavelength laser for the delayed ionization, the effect of argon and argon dimer ionization on background generated by photoelectrons could successfully be eliminated, and the ionization efficiency was evaluated to be about 10% compared to that with a conventional technique of using a short-wavelength ultraviolet laser.