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

par Didriche, Keevin ;Lauzin, Clément ;Macko, Peter ;Lafferty, Walter J.;Saykally, Richard James;Herman, Michel
Référence Chemical physics letters, 463, 4-6, page (345-348)
Publication Publié, 2008

Article révisé par les pairs

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Résumé :

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. © 2008 Elsevier B.V. All rights reserved.