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Condensation of a supersaturated vapor. VI. The diffusivity and the size of photonucleating clusters in vapors containing CS2
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18.We found that mathematically it makes no difference which size of cluster absorbs this additional photon.
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23.This plot was obtained by first counting how many drops were detected in each 4 s time interval and then plotting the natural logarithm of the nucleation rate vs a time corresponding to the middle of each time interval.
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25.Note that all of the nucleation decay constants shown in the tables were calculated after discarding the initial few seconds of data obtained after the light was blocked.
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40.A listing of the FORTRAN program is available in: J. L. Katz and P. Mirabel, J. Atmos. Sci. 32, 646 (1975).
41.Note that the nucleation rates under our experimental conditions were always less than 3 drops Furthermore, even though the reaction rate constants are unknown and various other parameters (e.g., the concentration of photoinducer, the light intensity, etc.) have uncertainties, the same conclusions are obtained as long as conditions are chosen such that the steady state rate of nucleation calculated from the numerical solution is less than
42.To obtain the size of A, we assume that A is a spherical cluster consisting of n host molecules and that its density is equal to that of the host.
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47.One should note that the A’s themselves are not necessarily 5.4 Å in radius. What our measurements have determined is an effective “diffusivity” size. It may be that host molecules are attached to A in a sufficiently longlived fashion that their diffusivities are altered and their effective sizes are about 5.4 Å, but these “attached” host vapor molecules are in a rapid exchange equilibrium with surrounding unattached host vapor molecules.
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50.In the computation of the probability density, the size of A is assumed to be equivalent to that of a cluster consisting of several host molecules. Thus, Table VI is expressed in units of the number of host molecules. However, this choice of units should not be assumed to exclude the possibility that A contains a polymer or other reaction products.
51.A. W. Adamson, Physical Chemistry of Surfaces (Wiley, New York, 1982).
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