レーザー共鳴励起を利用した同位体レベルでの核種検出・同位体比測定手法の開発状況について，その原理から応用について紹介する。共鳴イオン化質量分析法（Resonance Ionization Mass Spectrometry: RIMS），キャビティリングダウン分光法（Cavity Ring-Down Spectroscopy: CRDS）や特に近年，希ガスの年代測定において利用が進んでいる原子トラップ微量分析法（Atom Trap Trace Analysis: ATTA）について応用例を取り上げる。また筆者が取り組んでいるイオントラップを利用した単一同位体イオン検出手法について紹介する。
State of the art techniques of trace isotope analysis using laser resonance excitation are reviewed including Resonance Ionization Mass Spectrometry, Caviry RingDown Spectroscopy, and Atom Trap Trace Analysis. Electronic structure of atoms, isotope shifts and hyperfine structure induced by nuclear spin are explained. The interaction between atoms and laser electric field and Rabi oscillation for efficient excitation of an electron are shown. The basic principle of laser cooling is described. Methodology and examples of trace isotope analysis using laser resonance excitation are summarized.
Key words: laser spectroscopic analysis; laser cooling; trace isotope analysis; resonance excitation of atoms
© Japan Radioisotope Association 2023. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/)© Japan Radioisotope Association 2023. This is an open access article distributed under the Creative Commons Attribution 4.0 International (CC BY 4.0) License (https://creativecommons.org/licenses/by/4.0/)
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