Figures & data
FIG. 1 Schematic of opposed flow diffusion charger.
FIG. 2 Experimental set-up to measure particle charge distribution.
FIG. 3 Mobility distribution of 131-nm PSL particles (DMA flow rates: 1.5 l min–1 aerosol, 16.5 l min–1 sheath air).
FIG. 4 Mean charge per particle in comparison with EAD/NSAM version (Jung and Kittelson Citation2005; Asbach et al. Citation2011).
FIG. 5 Measured (symbols) and fitted (lines) data for the charged fraction as a function of particle size for 1–5 (top) and 6–10 (bottom) elementary charges.
TABLE 1 Coefficients of lognormal charge distributions
FIG. 6 Fitting of parameters of lognormal distributions.
TABLE 2 Empirical coefficients for Equation (2)
FIG. 7 Charge distributions calculated from Equations (1) and (2), with coefficients in ; symbols indicate measured data.
TABLE 3 Regression coefficients of calculated (Equations 1 and 2) and measured charge fractions
FIG. 8 Charge distributions for 1–8 elementary charges from fitted distributions (according to Equations 1 and 2) and from Fuchs model with an nt product of 7 × 1012 s m−3, ion mobility of 1.15 × 10−4 m2 V−1 s−1, and ion mass of 0.13 kg mol−1.
