Optimized cell geometry for buffer-gas-cooled molecular-beam sources
| Autor: | Samanta, Amit K., Roth, Nils, Gusa, Daniel, Ossenbrüggen, Tim, Rubinsky, Igor, Horke, Daniel, Küpper, Jochen |
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| Jazyk: | angličtina |
| Předmět: | |
| Popis: | Physical review / A covering atomic, molecular, and optical physics and quantum information 97(3), 032704 (2018). doi:10.1103/PhysRevA.97.032704 We have designed, constructed, and commissioned a cryogenic helium buffer-gas source for producing a cryogenically cooled molecular beam and evaluated the effect of different cell geometries on the intensity of the produced molecular beam, using ammonia as a test molecule. Planar and conical entrance and exit geometries are tested. We observe a threefold enhancement in the $NH_3$ signal for a cell with planar entrance and conical-exit geometry, compared to that for a typically used “boxlike” geometry with planar entrance and exit. These observations are rationalized by flow field simulations for the different buffer-gas cell geometries. The full thermalization of molecules with the helium buffer gas is confirmed through rotationally resolved resonance-enhanced multiphoton ionization spectra yielding a rotational temperature of 5 K. Published by APS, Woodbury, NY |
| Databáze: | OpenAIRE |
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