Machine B was modified to study supersonic free-jet expansions of supercritical fluids. A photograph of the machine is shown below, where the source is towards the front of the camera and the detection region extends backwards to the upper left-hand side of the photo.
By interfacing our RESS source with Machine B we can study the size, composition and velocity distribution of the clusters and nanoparticles formed in the jet. In the figure below we show the nozzle-skimmer interaction and the structure of the supersonic free-jet expansion. More information can be found in Silvia De Dea's Ph.D thesis and in our publication, De Dea, S., Miller, D. R., and Continetti, R. E., "Cluster and Solute Velocity Distributions in Free Jet Expansions of Supercritical CO2", The Journal of Physical Chemistry A 113, 388 (2009).