Development of a versatile size analyzing nuclei counter (vSANC

Fakultät für Physik
Studienprogrammleitung Physik
Martin Hopf
Boltzmanngasse 5, 1090 Wien
T +43(1) 4277 60330
[email protected]
An alle Mitglieder der
Fakultät für Physik
Wien, am 09. Juni 2015
Einladung zur Defensio der Dissertation
Development of a versatile size analyzing nuclei counter (vSANC)
and application to ambient aerosol studies
Tamara Pinterich
Donnerstag, 18. Juni 2015, 14:00 Uhr
Lise-Meitner-Hörsaal, Boltzmanngasse 5, 1090 Wien
The operation of the versatile size analyzing nuclei counter (vSANC) is based on
heterogeneous nucleation of supersaturated vapor on preexisting aerosol particles and
subsequent droplet growth. Well-defined uniform vapor supersaturation is achieved by
adiabatic expansion. Thereby nanoparticles down to 1-2nm in diameter can be activated
and grow to visible sizes.
Absolute particle number concentrations ranging from 102cm-3 to 107cm-3 and droplet
growth curves are obtained by means of the multi-angle constant angle Mie scattering
During Spring 2014, the vSANC has been operated at the SMEAR II station in Finland. The
main goal was to investigate the formation and growth of atmospheric clusters. Using npropanol as working fluid, atmospheric new particle formation (NPF) was observed only
when operating temperatures were close to the ambient air temperature. Diurnal
concentration evolution during NPF events showed that the vSANC detected the NPF
signal 2-3 hours before a differential mobility particle sizer. A continously present pool of
highly concentrated neutral clusters in the sub-3nm diameter range could not be
confirmed during these measurements.
Peter H. McMurry, University of Minnesota, USA (Gutachter)
Wladyslaw Szymanski
Paul E. Wagner (Betreuer)
Martin Hopf (Vorsitz)