Journal Article

PUBDB-2018-05701

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Optimized cell geometry for buffer-gas-cooled molecular-beam sources

Singh, V. (First author)CFEL*DESY* ; Samanta, A. K.CFEL*DESY* ; Roth, N.CFEL*DESY* ; Gusa, D.DESY* ; Ossenbrüggen, T.CFEL*DESY* ; Rubinsky, I.CFEL*DESY* ; Horke, D.CFEL*DESY* ; Küpper, J. (Corresponding author)CFEL*DESY*

2018
APS Woodbury, NY

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Please use a persistent id in citations: doi:10.1103/PhysRevA.97.032704  doi:10.3204/PUBDB-2018-05701

Abstract: 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.

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Contributing Institute(s):

1. CFEL-Coherent X-Ray Imaging (FS-CFEL-1)
2. CFEL-CMI (FS-CFEL-CMI)
3. beauftragt von UNI (UNI/CUI)
4. Uni Hamburg / Experimentalphysik (UNI/EXP)

Research Program(s):

1. 6211 - Extreme States of Matter: From Cold Ions to Hot Plasmas (POF3-621) (POF3-621)
2. COMOTION - Controlling the Motion of Complex Molecules and Particles (614507) (614507)
3. CUI - Hamburger Zentrum für ultraschnelle Beobachtung (194651731) (194651731)
4. IVF - Impuls- und Vernetzungsfonds (IVF-20140101) (IVF-20140101)

Experiment(s):

1. Experiments at CFEL

Appears in the scientific report 2018

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Database coverage:
; ; ; Clarivate Analytics Master Journal List ; Current Contents - Physical, Chemical and Earth Sciences ; Ebsco Academic Search ; IF < 5 ; JCR ; SCOPUS ; Science Citation Index ; Science Citation Index Expanded ; Web of Science Core Collection

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