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MUST2022 Conference- a great success!
New scientific highlights- by MUST PIs Wörner, Chergui, and Richardson
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New scientific highlight- by MUST PIs Milne, Standfuss and Schertler
EU XFEL Young Scientist Award for Camila Bacellar,beamline scientist and group leader of the Alvra endstation at SwissFEL
Prizes for Giulia Mancini and Rebeca Gomez CastilloICO/IUPAP Young Scientist Prize in Optics & Ernst Haber 2021
Nobel Prize in Chemistry awarded to RESOLV Member Benjamin List- for the development of asymmetric organocatalysis
NCCR MUST at Scientifica 2021- Lightning, organic solar cells, and virtual molecules

Time-resolved photoelectron spectroscopy of solvated systems

    Dr. Matthew Brown

ETH Zürich
HCI G217
CH-8093 Zürich
+41 44 632 3048
Project start   10.12.2011 
Project end   30.11.2014
Goal for 2014   The photoionization dynamics of liquid water will be measured with attosecond temporal resolution using the RABBIT technique. These measurements will be repeated using the attosecond streak camera and will be extended to measure the photoionization dynamics of solvated systems.
Goals   The main goal of this project is the development of time-resolved photoelectron spectroscopy of solvated systems. Our initial target will be water itself with the goal of resolving the photoionization dynamics on an attosecond time scale and comparing the dynamics with gas-phase water. These studies will be extended to various solvated systems such as molecules, transition metal complexes and nanoparticles. In combination with a recently completed time-preserving monochromator for high-harmonic radiation, we will be able to investigate the mechanisms of electronic excitation and electronic dynamics in solvated systems, which have eluded previous investigations because of their extreme time scale. This insight may contribute to the design of more efficient catalysts or the understanding of biological processes.
Inga Jordan
+41 44 633 49 78
Laboratory for physical chemistry, ETH-Hönggerberg,
Wolfgang-Pauli-Str. 10,
8093 Zurich
Matthew Brown
+41 44 632 30 48
Institute of Chemical and Bioengineering,

Wolfgang-Pauli-Str. 10,
8093 Zurich

Jeroen van Bokhoven
HCI E 127
+41 44 632 55 42
Institute of Chemical and Bioengineering,
Wolfgang-Pauli-Str. 10,
8093 Zurich
Abstract    We have developed a new experimental setup combining a liquid microjet in high vacuum with an extreme-ultraviolet (XUV) laser source for time-resolved photoelectron studies of solvated systems. The XUV radiation is produced through high-harmonic generation and yields pulses with femtosecond to attosecond durations. The liquid microjet technique allows to bridge the pressure gap between ultrahigh-vacuum surface science and ambient pressure chemistry and thereby expands the scope of photoelectron spectroscopic investigations to the liquid phase.
We will study electronic dynamics in metal complexes, nanoparticles and biologically relevant molecules. In the first phase of the project, we will couple the new spectrometer to an innovative, actively stabilized interferometer to perform infrared / XUV pump-probe experiments with attosecond resolution. In the second phase, we will investigate the femtosecond dynamics following excitation of a solvated sample by an ultraviolet pump pulse.
Publications   Brown, M.A., Duyckaerts, N., Redondo, A.B., Jordan, I., Nolting, F., Kleibert, A., Ammann, M., Wörner, H.J., van Bokhoven, J.A., and Abbas, Z. (2013a) Effect of Surface Charge Density on the Affinity of Oxide Nanoparticles for the Vapor-Water Interface. Langmuir 29, 5023-5029 (10.1021/la4005054) Brown-2013b (1.06 MB)

Brown, M.A., Jordan, I., Redondo, A.B., Kleibert, A., Woerner, H.J., and van Bokhoven, J.A. (2013b) In situ photoelectron spectroscopy at the liquid/nanoparticle interface. Surf Sci 610, 1-6 (10.1016/j.susc.2013.01.012) Brown-2013c (823 KB)

Brown, M.A., Redondo, A.B., Jordan, I., Duyckaerts, N., Lee, M.T., Ammann, M., Nolting, F., Kleibert, A., Huthwelker, T., Machler, J.P., Birrer, M., Honegger, J., Wetter, R., Wörner, H.J., and van Bokhoven, J.A. (2013c) A new endstation at the Swiss Light Source for ultraviolet photoelectron spectroscopy, X-ray photoelectron spectroscopy, and X-ray absorption spectroscopy measurements of liquid solutions. Rev Sci Instrum 84,  073904 (10.1063/1.4812786) Brown-2013a (2.14 MB).

Jordan, I., Redondo, A.B., Brown, M.A., Fodor, D., Staniuk, M., Kleibert, A., Worner, H.J., Giorgi, J.B., and van Bokhoven, J.A. (2014) Non-uniform spatial distribution of tin oxide (SnO2) nanoparticles at the air-water interface. Chem Commun 50, 4242-4244 (10.1039/c4cc00720d) Jordan-2014 (1.25 MB).

Beloqui Redondo, A., Jordan, I., Ziazadeh, I., Kleibert, Giorgi, J.B., Wörner, H.J., May, S., Abbas, Z., and Brown, M.A. (2015) Nanoparticle-Induced Charge Redistribution of the Air–Water Interface. J Phys Chem C 119,  2661-2668 (10.1021/jp511915b) Beloqui-2015 (2.45 MB).

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