Many samples of current interest in molecular physics and physical chemistry exist in the liquid phase and are vaporized for use in gas cells, diffuse gas targets, or molecular gas jets. For some of these techniques, the large sample consumption is a limiting factor. When rare, expensive molecules such as custom-made chiral molecules or species with isotopic labels are used, wasting them in the exhaust line of the pumps is quite an expensive and inefficient approach. Therefore, we developed a closed-loop recycling system for molecules with vapor pressures below atmospheric pressure. Once filled, only a few valves have to be adjusted, and a cold trap must be moved after each phase of recycling. The recycling efficiency per turn exceeds 95%.

中文翻译：

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稀有液体样品的闭环再循环，用于气相实验

当前在分子物理学和物理化学中感兴趣的许多样品都存在于液相中，并被汽化以用于气室，扩散气体靶或分子气体射流。对于其中的某些技术，大量的样品消耗是一个限制因素。当使用稀有昂贵的分子（例如定制的手性分子或具有同位素标记的物质）时，将它们浪费在泵的排气管路中是相当昂贵且效率低下的方法。因此，我们为蒸气压低于大气压的分子开发了一种闭环回收系统。填充后，只需调整几个阀门，并且在每个回收阶段之后都必须移动一个冷阱。每转的回收效率超过95％。