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Optimized cell geometry for buffer-gas-cooled molecular-beam sources
- Source :
- Phys. Rev. A 97, 032704 (2018)
- Publication Year :
- 2018
-
Abstract
- We have designed, constructed, and commissioned a cryogenic helium buffer-gas source for producing a cryogenially-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 three fold enhancement in the NH$_3$ signal for a cell with planar-entrance and conical-exit geometry, compared to that for a typically used `box'-like 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 REMPI spectra yielding a rotational temperature of 5 K.
- Subjects :
- Physics - Chemical Physics
Physics - Fluid Dynamics
Subjects
Details
- Database :
- arXiv
- Journal :
- Phys. Rev. A 97, 032704 (2018)
- Publication Type :
- Report
- Accession number :
- edsarx.1801.10586
- Document Type :
- Working Paper
- Full Text :
- https://doi.org/10.1103/PhysRevA.97.032704