ペニングトラップ質量スペクトロメトリーによる超安定電子状態の検出
R X Schüssler1, H Bekker2,3, M Braß4
1Max Planck Institute for Nuclear Physics, Heidelberg, Germany. rima.schuessler@mpi-hd.mpg.de.
Nature
|May 8, 2020
まとめ
研究者は,高電荷イオン (HCI) で長寿命のメタステーブルな電子状態を特定しました. この発見は 基礎物理学の研究のための 精密な 柔らかいX線原子時計の開発を進めています
科学分野:
- 原子物理学
- メトロロジー
- 量子情報科学
背景:
- 最先端の光学時計は 高精度な原子組や 閉じ込められたイオンを使用しています
- 高電荷イオン (HCI) と核変異は,乱射に対する無感性があるため,次世代の時計にとって有望である.
- 正確な原子構造計算は,時計の適切なHCI移行を特定するために不可欠です.
研究 の 目的:
- 高電荷イオン (HCI) で長寿命のメタステーブル電子状態の観測を報告する.
- レニウムの電子刺激エネルギーの非破壊的,直接的な決定を提供する.
- 柔らかいX線周波数基準を特定し,特徴づけるための新しい方法を示す.
主な方法:
- 高精度ペニングトラップ質量スペクトロメーター PENTATRAPを使用した.
- HCIのグラウンド状態とメタステーブル状態の間のサイクロトロン周波数比を測定した.
- グラウンドと興奮状態の質量差を決定し,電子興奮エネルギーを得ます.
主要な成果:
- 高電荷のイオン (レニウム) で長寿命のメタステーブルな電子状態を観測した.
- サイクロトンの周波数比を10−11の精度で測定した.
- 4.96 × 1016 Hz (202 eV) の潜在的な柔らかいX線周波数基準を,線幅5 × 10−8 Hzと品質因子1024で決定した.
結論:
- 原子構造の計算と一致しています.
- 開発された方法は,HCIsのさらなるソフトX線クロック移行の検索を可能にします.
- この研究は,基礎物理学の精度研究にとって極めて重要です.
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