Nucleation at high pressure. II. Wave tube data and analysis

Nucleation rate data, obtained from expansion wave tube experiments, are re ported for several vapor-gas mixtures at high pressure. Results are given f or water-vapor in the presence of helium and nitrogen gas, and for n-nonane in helium and methane. For all these mixtures, carrier gas pressures of 10 , 25, and 40 bar have been applied, with temperatures ranging from 230 to 2 50 K. An extended form of the nucleation theorem (in terms of the derivativ e of the nucleation rate with respect to carrier gas pressure! is derived, which appears to be very helpful in the interpretation of high pressure dat a. It can be used to obtain the carrier gas content of the critical nucleus directly from the pressure dependence of experimental nucleation rates. Co mbining this method with the theoretical considerations of part I of this p aper [J. Chem. Phys. 111, 8524 (1999), preceding paper]: the nucleation beh avior of water at high pressures of both helium and nitrogen can quantitati vely be understood. For n-nonane in helium our "pressure perturbation appro ach'' is also valid. For n-nonane in methane, however, this approach fails because of the high methane solubility in the liquid phase. (C) 1999 Americ an Institute of Physics. [S0021-9606(99)51841-2].