Abstract
A quantitative measurement of laser light extinction during particle growth in an expansion chamber of a condensation nuclei counter was performed. The attenuated light flux and the light flux scattered at a chosen scattering angle are monitored simultaneously during the particle growth process. From the transmitted light flux vs time the light extinction during particle growth can be determined quantitatively. The experimental scattered light flux vs time allows a precise determination of particle sizes at various times during particle growth. Knowing the actual particle size the light attenuation obtained from the transmitted light flux allotis a direct, quantitative determination of particle number concentration without referring to any calibration of the apparatus and can be regarded as an absolute method.
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