Mainz 2017 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 18: Helium Droplets and Systems (with MO)
A 18.1: Hauptvortrag
Dienstag, 7. März 2017, 14:30–15:00, N 6
Cluster Studies with the BerlinTrap — •Pablo Nieto, Alan Günther, David Müller, Alex Sheldrick, and Otto Dopfer — Institut für Optik und Atomare Physik, Technische Universität Berlin, Hardenbergstr. 36, D-10623 Berlin, Germany
The first experiments using a novel tandem mass spectrometer (BerlinTrap) which combines an electrospray ion source, a quadrupole mass spectrometer, a cryogenic 22-pole ion trap (4-300 K), and an orthogonal reflectron time-of-flight mass spectrometer [1] are presented. First, the generation of small He clusters around cold metal ions (HenMq+) by successive aggregation of He atoms is presented. The attraction between a positive charge and the surrounding He leads to the formation of a shell of strongly bonded atoms around the ion often called snowball. The study of He snowballs has been carried out in the last years by photo- or electron impact ionization of the atom or molecule embedded in relatively large He droplets. This study constitutes the first bottom-up approach to the formation of He snowballs around an ion using a gentle growth scheme. The formation of some clusters with a given (magic) number of He atoms is greatly enhanced signaling a high relative stability. In the second part of the talk structure and optical absorption properties of metalated flavins in the gas phase are discussed. The present results illustrate the broad variety of atomic and molecular ionic clusters which can be studied with the BerlinTrap by mass spectrometry and spectroscopy.
[1] A. Günther, P. Nieto, D. Müller, A. Sheldrick, D. Gerlich, and O. Dopfer, J. Mol. Spectrosc., in press, DOI:10.1016/j.jms.2016.08.017