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Journal of the Korean Physical Society

Time-of-Flight Mass Spectrometer Combined with a Magneto-Optical Trap for an Isotope Analysis of Strontium

Kwang-Hoon Ko, Do-Young Jeong, Cha Hyung Ki, Taek‐Soo Kim, Dukhyeon Kim, You-Kyoung Lim, Lim Gwon

Published Jan 1, 2006• 2 citations
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The isotope selectivity of the strontium (Sr) magneto-optical trap (MOT) is measured by a time-of-flight (TOF) mass spectrometer. The thermally generated Sr atoms are slowed down by the Zeeman slowing technique and trapped by the magneto-optical method. The trapped atoms are photoionized by the nonresonant two-photon ionization, and the generated ions are analyzed by the TOF mass spectrometer. The isotope selectivity of the MOT is up to approximately 2000 for 86Sr, and the overall selectivity of the system, which consists of the MOT and the mass spectrometer is also discussed.
A method using a combination of a magneto-optical trap and a mass spectrometer, referred to as atom trap-mass spectrometry (ATMS), is employed for calcium-isotope analysis. A calcium magneto-optical trap with a Zeeman slower is used in the first isotope-selection stage of the ATMS. The trapped calcium isotope is ionized by using a frequency-doubled Nd:YAG laser, and the photoions are analyzed using a time-of-flight mass spectrometer. The isotope-selection characteristics of the combination method and further improvements in the method are discussed in this work.