Direct FTIR high resolution probe of small and medium size Arn(CO2)m der Waals complexes formed in a slit supersonic expansion - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Molecular Spectroscopy Année : 2006

Direct FTIR high resolution probe of small and medium size Arn(CO2)m der Waals complexes formed in a slit supersonic expansion

Résumé

A slit nozzle continuous expansion of argon seeded with carbon dioxide is probed using a Bruker IFS 120 HR FTIR spectrometer operating at 0.05 cm−1 or 0.01 cm−1 spectral resolution. About 250 individual rovibrational transitions are assigned which belong to the asymmetric stretch of the CO2 moiety in Ar-CO2 and (CO2)2 complexes. This made it possible to refine the set of spectroscopic constants characterizing these van der Waals species. Analysis of the observed spectral features allowed for evaluation of the number densities of complexes formed in a jet. The manifold of rovibrational lines of van der Waals complexes (along with the monomer lines) sits on an unresolved pedestal, the shape of which varies dramatically as a function of reservoir pressure and initial CO2-Ar mixing ratios. Thorough examination of these variations allows for the observed features to be assigned to Arn(CO2)m clusters formed in CO2 seeded Ar expansion.

Dates et versions

hal-00653440 , version 1 (19-12-2011)

Identifiants

Citer

Jonathan Thiévin, Y. Cadudal, Robert Georges, Andrei Vigasin. Direct FTIR high resolution probe of small and medium size Arn(CO2)m der Waals complexes formed in a slit supersonic expansion. Journal of Molecular Spectroscopy, 2006, 240 (2), pp.141-152. ⟨10.1016/j.jms.2006.09.010⟩. ⟨hal-00653440⟩
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