Abstract
The condensation produced in planar supersonic jets of CO2 from a 0.13×3.0 mm slit nozzle is investigated quantitatively by means of Raman and Rayleigh scattering. The rotational and vibrational temperatures of the free-monomers bath, the cluster number density nc, and the mean cluster size N are obtained for several jets with stagnation pressures P0 from 1 to 3 bar and 295 K stagnation temperature. In a planar jet, the distance to a collision-free regime is larger than in an axisymmetric expansion through a circular nozzle, allowing more clusters to be formed through three-or two-body collisions. Data on the first stage of the nucleation and cluster growth processes in planar expansions are reported here, and are compared with previous data in axisymmetric jets [Ramos et al. Phys. Rev. A 72, 053204 (2005)]. On the basis of Raman spectra we investigate here the formation and evolution of the clusters, and the coexistence of liquid and solid CO2. An inverse correlation between vibrational temperature of the free monomers and the mean cluster size N is also observed, suggesting some kind of cluster-mediated mechanism for the vibrational relaxation in CO2.
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