Dr
Gustavo Garcia
(Synchrotron SOLEIL)
30/09/2014, 11:50
Talk
Radicals are key intermediate species whose detection and study lead to invaluable knowledge on the mechanism of the reactions where they participate. However, their reactivity makes their stable production a challenge, and often clean production is not possible as they are detected alongside many other byproducts, including an excess of precursor.
Here, we will show how double imaging...
Prof.
Katharina Kohse-Höinghaus
(Department of Chemistry, Bielefeld University)
30/09/2014, 14:00
Talk
The transition towards renewable and sustainable energy is thought to phase out combustion. With growing population, industrial production and transportation especially in emerging economies, and with substantial life spans of current technology, this transition will, however, take decades. Cleaner combustion with higher efficiency and reduced emissions must thus be addressed with urgency....
Prof.
Mitchio Okumura
(California Institute of Technology)
30/09/2014, 14:25
Talk
Peroxy radicals are important intermediates in the oxidation of Volatile Organic Compounds(VOCs) in the troposphere, and play a crucial role in air pollution, the formation of photochemical smog and organic aerosols. The reactions of peroxy radicals with the hydroperoxyl radical are important loss processes in atmospheres with low nitrogen oxide concentrations. Laboratory studies of the...
Prof.
Ingo Fischer
(Universität Würzburg)
30/09/2014, 14:50
Talk
Threshold photoelectron-photoion coincidence spectroscopy (TPEPICO, iPEPICO) is an excellent method to obtain structural and thermochemical information on molecules. The enhanced properties of new synchrotron radiation (SR) sources now permit to study molecules that are only available in small quantities, among them reactive open-shell molecules or inorganic species. In this presentation I...
Melanie Lang
(Universitaet Wuerzburg)
30/09/2014, 15:45
Talk
Diazomeldrum’s acid (DMA) is a molecule used in the investigation of the photoinduced and thermal induced Wolff rearrangement reaction and therefore of importance in photolithography.
We investigated DMA in an imaging photoelectron photoion coincidence study with the (iPEPICO) setup at X04DB VUV Beamline at the Swiss Light Source.
The threshold photoelectron spectrum (TPES) of DMA will be...
Fabian Holzmeier
(Universität Würzburg)
30/09/2014, 16:05
Talk
Isocyanic acid HNCO, a small molecule of great importance for the chemistry in the interstellar space, was investigated in a threshold photoelectron photoion coincidence (TPEPICO) experiment at the DESIRS vacuum ultraviolet (VUV) beamline at the SOLEIL synchrotron. Due to the high resolution of the DELICIOUS III experiment, the ionization energies of the first electronic states of HNCO were...
Prof.
Balint Sztaray
(University of the Pacific)
30/09/2014, 16:25
Talk
Photoelectron photoion coincidence (PEPICO) spectroscopy is a marriage of photoelectron spectroscopy and mass spectrometry. Electron / ion pairs are created by single photon ionization and the two charged species are measured in delayed coincidence with each other. Ions are selected in narrow range of internal energy by collecting only ions created in delayed coincidence with the...
Ms
Victoria Custodis
(ETH Zürich)
30/09/2014, 16:50
Talk
Catalytic fast pyrolysis is an effective method for polymerization and stabilization of reactive intermediates.1 Understanding the depolymerization mechanism during pyrolysis is evidently critical for establishing the parameters that influence the selectivity and yield of the products. During fast pyrolysis many different reaction mechanisms compete2, but also radical formation by homolytic...
Prof.
Richard Tuckett
(University of Birmingham)
01/10/2014, 08:30
Talk
At low resolution, the first photoelectron band of CH2F2, first recorded in the 1970s at a resolution of ca. 800 cm-1 (or 0.1 eV), shows an apparently simple progression in the HCH bending mode. This is consistent with the large reduction in HCH bond angle, from ca. 113o to 85o, predicted by ab initio calculations. As new technologies and photon sources have evolved over the last 40 years...
Prof.
Xiaoguo Zhou
(Department of Chemical Physics, University of Science and Technology of China)
01/10/2014, 08:55
Talk
Photoionization and dissociative photoionization of vinyl chloride (C2H3Cl) in the excitation energy range of 11.0~14.5 eV were investigated with the method of threshold photoelectron-photoion coincidence (TPEPICO) velocity imaging. Only C2H335Cl+ and C2H337Cl+ molecular ions with a ratio of their natural abundances were detected in the TPEPICO time-of-flight (TOF) mass spectrum at 11.67 eV,...
Dr
Xiaofeng TANG
(Synchrotron SOLEIL, Gif sur Yvette, France)
01/10/2014, 09:20
Talk
The dissociation of halogenated methane ions in different electronic states is interesting since it usually undergoes specific reactions to different products. Presently we are focusing on methyl fluoride ion CH3F+, the lightest halogenated methane, which should exhibit specific dissociation dynamics too.
We will present a detailed study of the photoionization and dissociative...
Dr
Hans-Martin Frey
(University of Bern)
01/10/2014, 09:45
Talk
The gas phase rotational motion of the all trans alkanes butane to octane has been measured in real time using femtosecond (fs) time resolved rotational Raman rotational coherence spectroscopy (RR-RCS) at two temperatures T=160 and 295 K. Four-wave mixing transients are recorded over times up to 5 ns. The method probes the rotation of non-polar (and polar) gas phase molecules with fs time...
Dr
Elke Goos
(DLR Deutsches Zentrum für Luft- und Raumfahrt e.V (German Aerospace Center))
01/10/2014, 10:10
Talk
2-Methylfurane, which can be produced from uneatable biomass, has the potential to be used as alternative fuel in engines. Its combustion chemistry was investigated within the last few years by several groups. But much less knowledge is available about its thermal pyrolysis behaviour, especially the formation of intermediates and pollutants, which can be produced at fuel rich combustion...
