冷$\mathrm{RaOH}^+$和${\mathrm{RaOCH}_3}^+$的光学质谱
Optical Mass Spectrometry of Cold $\mathrm{RaOH}^+$ and ${\mathrm{RaOCH}_3}^+$
摘要：
我们提出了一种全光学质谱技术来识别捕获的离子。新方法使用激光冷却离子来确定一个共同捕获的暗离子的质量，在几秒钟内达到亚道尔顿的分辨率。我们应用该方法来确定第一个控制合成的冷，捕获$\mathrm{RaOH}^+$和${\mathrm{RaOCH}_3}^+$。这些分子对时间和宇称违反的敏感性很有希望，这些违反可能限制标准模型之外的新物理学来源。质谱技术的非破坏性性质可以帮助在光学光谱之前识别分子离子或高电荷离子。与先前用于依赖于扫描的小离子晶体的质谱技术不同，该方法使用固有宽带且相对快速的傅立叶变换。该技术的速度为研究离子阱中的状态分辨化学反应提供了新的机会。
英文摘要：
We present an all-optical mass spectrometry technique to identify trapped ions. The new method uses laser-cooled ions to determine the mass of a cotrapped dark ion with a sub-dalton resolution within a few seconds. We apply the method to identify the first controlled synthesis of cold, trapped $\mathrm{RaOH}^+$ and ${\mathrm{RaOCH}_3}^+$. These molecules are promising for their sensitivity to time and parity violations that could constrain sources of new physics beyond the standard model. The nondestructive nature of the mass spectrometry technique may help identify molecular ions or highly charged ions prior to optical spectroscopy. Unlike previous mass spectrometry techniques for small ion crystals that rely on scanning, the method uses a Fourier transform which is inherently broadband and comparatively fast. The technique's speed provides new opportunities for studying state-resolved chemical reactions in ion traps.
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