Mainz 2017 – wissenschaftliches Programm

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MS: Fachverband Massenspektrometrie

MS 2: Precision Mass Spectrometry and Fundamental Applications II

MS 2.2: Vortrag

Montag, 6. März 2017, 17:30–17:45, RW 2

A Cryogenic Single Nanoparticle Mass and IR Spectrometer — •Tim K. Esser and Knut R. Asmis — Wilhelm-Ostwald-Institut für Physikalische und Theoretische Chemie, Universität Leipzig, Linnestrasse 2, D-04103 Leipzig, Germany

Nanoparticles play an increasingly important role for the development of new materials e.g. for electrotechnology, catalysis and medicine. These particles exist in the atmosphere and participate in the formation of cloud condensation nuclei which directly impact the climate. Despite the environmental relevance, many of their properties are still not well understood. Here, we describe a cryogenic mass and infrared (IR) spectrometer to investigate the surface structure and chemistry of a single nanoparticle. The nanoparticle is confined in a quadrupole ion trap and oscillates with a frequency characteristic for its mass-to-charge (m/z) ratio. Optical detection of this frequency enables mass assignment with ppm resolution. The setup can monitor the mass variation of a single nanoparticle, as a function of temperature (10-350 K), background gas and interaction with light, over several days. IR spectra will be obtained and compared to data from solids and gas phase clusters.