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Conference on Lasers and Electro-Optics Pacific Rim (CLEO-PR)

Combination method of atom trap and time-of-flight mass spectrometer for Ca isotope analysis

Kwang-Hoon Ko, Kyu‐Ha Jang, Yong Hee Kim, Lim Lee, Taek-Soo Kim, Hyunmin Park, Gun‐Sik Park, Yong-Ho Cha, Gwon Lim, Do-Young Jeong

Published Jun 1, 2013• 0 citations
Publisher

Abstract

The coupling of the atom trap and the time-of-flight mass spectrometer is demonstrated using calcium atom. The design of the acceleration unit is introduced and the isotope selective characteristics of the systems are discussed.
DOI
10.1109/cleopr.2013.6600611

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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.
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We demonstrate a combination of an isotopically purified atom beam and a magneto-optical trap which enables single-atom detection of all stable isotopes of calcium (40, 42, 43, 44, 46, and 48). These isotopes range in abundance from 96.9% (40Ca)(^{40}\mathrm{Ca})(40Ca) to 0.004% (46Ca)(^{46}\mathrm{Ca})(46Ca). The trap is loaded from an atomic beam which is decelerated in a Zeeman slower and subsequently deflected over an angle of 30\ifmmode^\circ\else\textdegree\fi{} by optical molasses. The isotope selectivity of the Zeeman slower and the deflection stage is investigated experimentally and compared with Monte Carlo simulations.
An Atom Trap Trace Analysis (ATTA) system based on the technique of laser manipulation of neutral atoms is being developed to count individual {sup 41}Ca atoms present in natural samples with an isotopic abundance of 10{sup -15}. Trapping of all stable calcium isotopes has been demonstrated and single-atom counting has been realized. For the most abundant isotope, {sup 40}Ca (97% isotopic abundance), a magneto-optical trap (MOT) loading rate of 2 x 10{sup 10} atoms/s has been reached at the overall capture efficiency of 1 x 10{sup -4}. System improvements could increase the efficiency by at least an order of magnitude.
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