Journal
NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS
Volume 268, Issue 15, Pages 2458-2466Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.nimb.2010.05.005
Keywords
37.20.+j
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Funding
- French government
- Austrian government
- Moroccan government
- EU Commission (Brussels), through the Agence Nationale de la Recherche [ANR-06-BLAN-0319-02]
- PICS [CNRS 2290]
- CNRS-CNRST [17689]
- EPSRC [EP/E039618/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [EP/E039618/1] Funding Source: researchfish
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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 < 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, determined 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 Troitskii's [Sov. Phys. JETP 7 (1962)353] analytical law for (cos theta)(3/2) angular dependence in the intermediate regime with error functions associated with the mean free path between intermolecular collisions. (C) 2010 Elsevier B.V. All rights reserved.
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