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Erlangen 2018 – scientific programme

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MO: Fachverband Molekülphysik

MO 3: Photoelectron Spectroscopy

MO 3.6: Talk

Monday, March 5, 2018, 12:00–12:15, PA 2.150

Photoelectron Spectroscopy of Triplet Pentadiynylidene and Methylpentadiynylidene — •Engelbert Reusch1, Domenik Schleier1, Patrick Hemberger2, and Ingo Fischer11Institute of Physical and Theoretical Chemistry, University of Würzburg, Am Hubland, D-97074, Germany — 2Laboratory for Femtochemistry and Synchrotron Radiation, Paul Scherrer Institut (PSI), CH-5232 Villigen, Switzerland

Highly unsaturated and carbon-rich chain molecules like Pentadiynylidene (HC5H) and Methylpentadiynylidene (MeC5H) occur as unstable intermediates in harsh chemical environments. They are well studied by various techniques like matrix isolated IR, EPR and UV/VIS spectroscopy.[1] Nevertheless, Threshold Photoelectron Spectra (TPES) of HC5H and MeC5H didn't exist. To obtain first insights we applied imaging Photoelectron Photoion Coincidence Spectroscopy in this study, which is capable to supply mass selective TPES. 1-Diazo-penta-2,4-diyne and 1-Diazo-hexa-2,4-diyne were selected as excellent precursors generating Triplet Pentadiynylidene and Methylpentadiynylidene. Ensuing the corresponding carbenes were produced by flash pyrolysis, stabilized in the gas phase and photoionized by tunable vacuum ultraviolet synchrotron radiation. This presentation will offer first results in the Photoelectron Spectroscopy of Pentadiynylidene and Methylpentadiynylidene, executed at the Swiss Light Source (SLS) for synchrotron radiation. [1] Bowling, N. P.; Halter, R. J.; Hodges, J. A.; Seburg, R. A.; Thomas, P. S.; Simmons, C. S.; Stanton, J. F.; McMahon, R. J., J. Am. Chem. Soc., 128, 3291-3302 (2006).

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