NUCLEATION OF 1-PENTANOL USING A THERMAL-DIFFUSION CLOUD CHAMBER

We report results of new nucleation experiments involving 1-pentanol w ith hydrogen as the background gas obtained from constant pressure cri tical supersaturation measurements and from constant temperature criti cal supersaturation experiments utilizing the high-pressure diffusion cloud chamber. We continue to observe significant background gas effec ts upon nucleation that we have reported previously; and we briefly di scuss the important issue of stability (the absence of buoyancy-driven convective motion of the gas-vapor mixture) within the cloud chamber. We apply our previously determined criteria for establishing the uppe r limit of total pressure to be used during nucleation investigations involving thermal diffusion cloud chambers to the experiments describe d in this report. (C) 1998 American Association for Aerosol Research.