| ATOMIC AND MOLECULAR PHYSICS |
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An Experimental Observation of Axial Variation of Average Size of Methane Clusters in a Gas Jet |
HAN Ji-Feng, YANG Chao-Wen, MIAO Jing-Wei, LU Jian-Feng, LIU Meng, LUO Xiao-Bing, SHI Mian-Gong |
| School of Nuclear Science and Technology, Sichuan University, Chengdu610064 |
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| Cite this article: |
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HAN Ji-Feng, YANG Chao-Wen, MIAO Jing-Wei et al 2010 Chin. Phys. Lett. 27 043601 |
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Abstract Axial variation of average size of methane clusters in a gas jet produced by supersonic expansion of methane through a cylindrical nozzle of 0.8 mm in diameter is observed using a Rayleigh scattering method. The scattered light intensity exhibits a power scaling on the backing pressure ranging from 16 to 50 bar, and the power is strongly Z dependent varying from 8.4 (Z=3 mm) to 5.4 (Z=11 mm), which is much larger than that of the argon cluster. The scattered light intensity versus axial position shows that the position of 5 mm has the maximum signal intensity. The estimation of the average cluster size on axial position Z indicates that the cluster growth process goes forward until the maximum average cluster size is reached at $Z=9$ mm, and the average cluster size will decrease gradually for Z>9 mm.
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| Keywords:
36.40.-c
52.40.Mj
52.50.Jm
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Received: 09 October 2009
Published: 27 March 2010
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| PACS: |
36.40.-c
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(Atomic and molecular clusters)
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52.40.Mj
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(Particle beam interactions in plasmas)
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52.50.Jm
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(Plasma production and heating by laser beams (laser-foil, laser-cluster, etc.))
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