“…103 The early work along these lines was hampered by experimental uncertainties in the particle size distribution and number concentration, which are required for quantitative comparisons between experiment and theory. 99,119 The first two careful studies to compare experimental CW-CRDS aerosol extinction data with corresponding Mie theory model calculations were Since that time, many groups have devoted extensive effort to aerosol extinction studies using CRDS methods, for a variety of aerosol systems: laboratory scale measurements of standard materials, 70,80,98,[103][104] lab synthesized SOA, 105,[122][123] field collected atmospheric aerosol samples, 70 aerosol generated from humic substances, 80 studies of relative humidity effects (RH) on optical properties, 124 coated aerosol particles, 125 organic atmospheric haze, 126 and single particle analysis. [127][128][129][130] Other groups have focused on improving the accuracy and sensitivity of the CRDS methods by investigating errors associated with statistical fluctuations due to low particle number concentrations, 101,103,[131][132][133] and uncertainties resulting from instrumental calibration effects.…”