Infrared spectroscopy of (CO2)N nanoparticles (30<N<14500) flowing in a uniform supersonic expansion

The infrared signature of carbon dioxide clusters of nanometric size is discussed both in the bending (ν2 mode at 15 μm) and in the asymmetric stretching (ν3 mode at 4.2 μm) spectral region of the monomer. The carbon dioxide nanoparticles were formed using a capillary tube injection inserted upstrea...

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Bibliographic Details
Published in:The Journal of chemical physics 2003-02, Vol.118 (8), p.3612-3621
Main Authors: Bonnamy, A., Georges, R., Benidar, A., Boissoles, J., Canosa, A., Rowe, B. R.
Format: Article
Language:English
Subjects:
Astrophysics
Chemical Physics
Instrumentation and Methods for Astrophysic
Physics
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Summary:The infrared signature of carbon dioxide clusters of nanometric size is discussed both in the bending (ν2 mode at 15 μm) and in the asymmetric stretching (ν3 mode at 4.2 μm) spectral region of the monomer. The carbon dioxide nanoparticles were formed using a capillary tube injection inserted upstream of a uniform supersonic flow of argon generated by a Laval nozzle. The size of the formed clusters was varied by changing the stagnation pressure P0 of the capillary. The empirical power law connecting P0 to the number N of monomers per cluster: N∝P02.2 was verified in this work. The cluster mean size was estimated using a Rayleigh scattering experiment showing the formation of nanometric clusters whose radii are in the range 0.7 nm
ISSN:0021-9606
1089-7690
DOI:10.1063/1.1539036