On the role of molecular clustering on infrared absorption line shapes of acetylene in a supersonic expansion

The role of molecular complexes in shaping the line profile in a supersonic expansion containing acetylene seeded into Ar is investigated. A supersonic expansion containing acetylene seeded into Ar and produced from a circular nozzle is investigated using CW/cavity ring down spectroscopy, in the 1.5...

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Bibliographic Details
Published in:Chemical physics letters 2008-10, Vol.463 (4), p.345-348
Main Authors: Didriche, K., Lauzin, C., Macko, P., Lafferty, W.J., Saykally, R.J., Herman, M.
Format: Article
Language:English
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Summary:The role of molecular complexes in shaping the line profile in a supersonic expansion containing acetylene seeded into Ar is investigated. A supersonic expansion containing acetylene seeded into Ar and produced from a circular nozzle is investigated using CW/cavity ring down spectroscopy, in the 1.5 μm range. The results, also involving experiments with pure acetylene and acetylene-He expansions, as well as slit nozzles, demonstrate that the denser central section in the expansion is slightly heated by the formation of acetylene aggregates, resulting into a dip in the monomer absorption line profiles. Acetylene–Ar aggregates are also formed at the edge of the circular nozzle expansion cone.
ISSN:0009-2614
1873-4448
DOI:10.1016/j.cplett.2008.08.086