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   To combine femtosecond ultraviolet (UV) and extreme ultraviolet (XUV) single
photon excitation with a velocity map imaging (VMI) photoelectron spectrometer
to understand structural and dynamic properties of ultrafine 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.
Publications  
  • Signorell, R., M. Goldmann, B. L. Yoder, A. Bodi, E. Chasovskikh, L. Lang and D. Luckhaus (2016). Nanofocusing, shadowing, and electron mean free path in the photoemission from aerosol droplets. Chem. Phys. Lett. 658: 1-6 (10.1016/j.cplett.2016.05.046) Signorell-2016 (1.04 MB) .
  • Gartmann, T. E., B. L. Yoder, E. Chasovskikh and R. Signorell (2017). Lifetimes and energetics of the first electronically excited states of NaH2O from time-resolved photoelectron imaging. Chemical Physics Letters (10.1016/j.cplett.2017.01.044) Gartmann-2017 (1.34 MB).
  • Luckhaus, D., Y.-i. Yamamoto, T. Suzuki and R. Signorell (2017). Genuine binding energy of the hydrated electron. Sci. Adv. 3. (10.1126/sciadv.1603224) Luckhaus-2017 (377 KB).
  • Gartmann, T.E., Ban, L., Yoder, B.L., Hartweg, S., Chasovskikh, E., and Signorell, R. (2019). Relaxation Dynamics and Genuine Properties of the Solvated Electron in Neutral Water Clusters. J Phys Chem Lett, 4777-4782. (https://doi.org/10.1021/acs.jpclett.9b01802)

     
 
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