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Absolute molecular flux and angular distribution measurements to characterize DNA/RNA vapor jets

Tabet, J.; Eden, S.; Feil, S.; Abdoul-Carime, H.; Farizon, B.; Farizon, M.; Ouaskit, S. and Märk, T. D. (2010). Absolute molecular flux and angular distribution measurements to characterize DNA/RNA vapor jets. Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms, 268(15) pp. 2458–2466.

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Vapor jets of DNA and RNA bases (adenine, cytosine, thymine, and uracil) from an oven with a capillary exit have been studied in the intermediate regime between molecular and viscous flow corresponding to Knudsen numbers in the range 0.1 < Kn < 10. The temperature control method ensured stationary flow. Assuming the Knudsen hypothesis, the pressure of sublimated molecules in the oven was determined as a function of temperature and the transmission probability of the capillary (Clausing factor). Thus it was possible to relate the oven temperature and pressure to the total flux through the capillary, deter- mined by measuring the total mass of DNA/RNA base molecules condensed on a cold surface intersecting the jet. The angular distribution of molecules in the jet has been also studied experimentally using an optical interference method. The measured profiles are in good agreement with Troïtskii’s [Sov. Phys. JETP 7 (1962) 353] analytical law for (cos h)3/2 angular dependence in the intermediate regime with error func- tions associated with the mean free path between intermolecular collisions.

Item Type: Journal Article
Copyright Holders: 2010 Elsevier B.V.
ISSN: 0168-583X
Project Funding Details:
Funded Project NameProject IDFunding Body
Not SetNot SetAgence Nationale de la Recherche [ANR-06-BLAN-0319-02]
Not SetNot SetPICS CNRS [2290]
Not SetNot SetCNRS-CNRST Convention [17689]
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
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Item ID: 25755
Depositing User: Sam Eden
Date Deposited: 22 Dec 2010 23:50
Last Modified: 22 Nov 2012 17:17
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