Towards time- and angle-resolved photoelectron spectroscopy of ultrafine weakly-bound aerosol particles

 
    Prof. Dr. Ruth Signorell
ETH Zurich
Laboratory for Physical Chemistry
Vladimir-Prelog-Weg 2
CH-8093 Zurich
Switzerland
Interaction of light with aerosol particles and nanoparticles
+41 44 633 4621 
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Project starts   1.4.2014
Project ends    31.12.2015
     
Goals   Combination of a femtosecond ultraviolet/visible (UV/VIS) laser system with a velocity map imaging (VMI) photoelectron spectrometer for pump-probe experiments on clusters and aerosol particles.
     
Project
partners
 
  Dr. Egor Chasovskikh
ETH Zurich
Laboratory for Physical Chemistry
Vladimir-Prelog-Weg 2
CH-8093 Zurich
Switzerland
 
Abstract    Nanometer-sized (<10 nm) weakly-bound aggregates built from molecules (referred to as “ultrafine aerosol particles”) play an important role in fundamental atmospheric processes, such as nucleation and cloud formation. Photoelectron spectroscopy provides information on the electronic structure of such nanosized species. We propose to study the dynamics of the first electronically excited state of sodium-dimethyl ether aggregates (Na(CH3OCH3)n) as a function of the number of dimethyl ether solvent molecules using a femtoseconds pump-probe scheme and angle-resolved photoelectron spectroscopy. The goal is to compare the results for dimethyl ether solvent with corresponding time-resolved data for sodium-ammonia aggregates (Na(NH3)n) to clarify the potential influence of hydrogen bonding on the excited state dynamics. XUV single photon ionization of ultrafine aerosol particles consisting of volatiles, such as water, methanol, dimethyl ether, and ammonia, is accompanied by a fast intra- cluster proton transfer. Our general goal of this project is to study how this proton transfer manifests itself in angle-resolved photoelectron spectra.
Dissemination   Thomas E. Gartmann, Bruce L. Yoder, Egor Chasovskikh, and Ruth Signorell, “Photoelectron spectrometer for time-resolved velocity map imaging of clusters and aerosol particles”, poster contribution, Gordon Research Conference on Photoionization & Photodetachment, Lucca, Italy, February 7-12, 2016

Ruth Signorell, “Angle-Resolved Photoelectron Spectroscopy of Aerosol Particles”, invited talk, Gordon Research Conference on Photoionization & Photodetachment,
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