Abstract
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%.
Highlights
Experiments on single molecules in the gas phase are clean and powerful as the systems are isolated from any perturbing environment
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
Compounds from the large group of chiral molecules became of high interest in molecular physics
Summary
Experiments on single molecules in the gas phase are clean and powerful as the systems are isolated from any perturbing environment. Only a few valves have to be adjusted, and a cold trap must be moved after each phase of recycling. The sample expands with its vapor pressure through a tiny nozzle (typically, 30 μm–200 μm), forming a supersonic gas jet when entering the vacuum chamber (referred to as expansion chamber).
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