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  Para-hydrogen and helium cluster size distributions in free jet expansions based on Smoluchowski theory with kernel scaling

Kornilov, O., & Toennies, J. P. (2015). Para-hydrogen and helium cluster size distributions in free jet expansions based on Smoluchowski theory with kernel scaling. Journal of Chemical Physics, 142(7): 074303. doi:10.1063/1.4907601.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0029-0ED3-2 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-9EEF-E
Genre: Journal Article

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 Creators:
Kornilov, Oleg, Author
Toennies, Jan Peter1, Author              
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1Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063297              

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 Abstract: The size distribution of para-H2 (pH2) clusters produced in free jet expansions at a source temperature of T0 = 29.5 K and pressures of P0 = 0.9–1.96 bars is reported and analyzed according to a cluster growth model based on the Smoluchowski theory with kernel scaling. Good overall agreement is found between the measured and predicted, Nk = A  ka e−bk , shape of the distribution. The fit yields values for A and b for values of a derived from simple collision models. The small remaining deviations between measured abundances and theory imply a (pH2)k magic number cluster of k = 13 as has been observed previously by Raman spectroscopy. The predicted linear dependence of b −(a+1) on source gas pressure was verified and used to determine the value of the basic effective agglomeration reaction rate constant. A comparison of the corresponding effective growth cross sections σ 11 with results from a similar analysis of He cluster size distributions indicates that the latter are much larger by a factor 6-10. An analysis of the three body recombination rates, the geometric sizes and the fact that the He clusters are liquid independent of their size can explain the larger cross sections found for He.

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Language(s): eng - English
 Dates: 2015-02-21
 Publication Status: Published in print
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 Rev. Method: -
 Identifiers: eDoc: 711944
DOI: 10.1063/1.4907601
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Title: Journal of Chemical Physics
Source Genre: Journal
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Pages: 11 Volume / Issue: 142 (7) Sequence Number: 074303 Start / End Page: - Identifier: -