Universitat Innsbruck

Siegfried Kollotzek

Fabio Zappa

Michael Renzler

Lorenz Kranabetter

Simon Albertini

Lukas Thiefenthaler

Paul Scheier

Felix Laimer

Paul Martini

Method for producing multiply-charged helium nanodroplets and charged dopant clusters and nanoparticles out of the helium nanodroplets, the method comprising: •producing neutral helium nanodroplets in a cold head () via expansion of a pressurized, pre-cooled, supersonic helium beam of high purity through a nozzle () into high vacuum with a base pressure under operation preferably below 20 mPa, •ionizing the helium nanodroplets by electron impact (), wherein the electron impact () leads to multiply-charged helium nanodroplets, •doping the charged helium nanodroplets with dopant vapor in the pickup cell (), wherein the doped nanodroplets form cluster ions with the initial charges acting as seeds, wherein the size of the nanoparticles can vary from a few atoms up to 105 atoms by arranging the size of the neutral helium nanodroplets, the charge of the helium nanodroplets and the density of dopant vapor in the pickup cell ().

Size selected clusters and nanoparticles

Growing community of inventors

Innsbruck, Austria

Siegfried Kollotzek