We propose and experimentally investigate a scheme for observing Feshbach resonances in atomic quantum gases in situ and with a high temporal resolution of several tens of nanoseconds. The method is based on the detection of molecular ions, which are optically generated from atom pairs at small interatomic distances. As a test system we use a standard rubidium gas (${}^{87}\mathrm{Rb}$) with well known magnetically tunable Feshbach resonances. The fast speed and the high sensitivity of our detection scheme allows us to observe a complete Feshbach resonance within one millisecond and without destroying the gas.

中文翻译：

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通过光缔合电离法快速原位观测原子的Feshbach共振

我们提出并实验研究了一种方案，该方案用于在原位观察原子菲斯巴赫共振，并且具有数十纳秒的高时间分辨率。该方法基于分子离子的检测，该分子离子是从原子对之间以较小的原子间距离光学生成的。作为测试系统，我们使用标准rub气（${}^{87}b$）具有众所周知的磁可调Feshbach共振。我们检测方案的快速和高灵敏度使我们能够在一毫秒内观察到完整的Feshbach共振，而不会破坏气体。