Monday, September 18, 2006, in EN6060 at 11:00AM.

Hygroscopic Tandem Differential Mobility Analyser

Kaarle Hämeri
University of Helsinki,

Abstract:

Hygroscopic Tandem Differential Mobility Analyser (HTDMA) has been widely used in studies of hygroscopic properties of atmospheric aerosols. This method provides indirect information on aerosol composition as well as the mixing state of particles (i.e. internal or external mixture). HTDMA has recently been developed towards smaller sizes and consequently applied on studies of new particle formation in atmosphere. Experimental data on particles of few nanometers in diameter is used to provide information on compounds responsible for nucleation and/or condensational growth during new particle formation events. This presentation summarizes results form recent field studies conducted in a boreal forest station in southern Finland.