Zobrazeno 1 - 10
of 12
pro vyhledávání: '"J. F. Eckhard"'
Publikováno v:
Journal of the American Chemical Society. 142:5862-5869
Mass-selected Ta8O2+ cluster ions catalyze the transformation of methane in a gas-phase ion trap experiment via nonoxidative coupling into ethane and H2, which is a prospective reaction for the gen...
Autor:
Uzi Landman, Robert N. Barnett, Martin Tschurl, Ueli Heiz, Tsugunosuke Masubuchi, J. F. Eckhard
Publikováno v:
The journal of physical chemistry. A. 125(24)
The energetics of small cationic tantalum clusters and their gas-phase adsorption and dehydrogenation reaction pathways with methane are investigated with ion-trap experiments and spin-density-functional-theory calculations. Tan+ clusters are exposed
Publikováno v:
Physical Chemistry Chemical Physics. 21:20743-20749
Cationic tantalum carbenes [TaCH2]+ and [Ta4CH2]+, products of thermal methane dehydrogenation, are collected and stored in a ring-electrode ion trap. In there, potential C–O coupling reactions are probed by exposing the tantalum carbenes to dioxyg
Autor:
Uzi Landman, Martin Tschurl, Ueli Heiz, J. F. Eckhard, Robert N. Barnett, Tsugunosuke Masubuchi
Publikováno v:
The Journal of Physical Chemistry C. 122:25628-25637
The gas-phase reactions of [TaxOy]+ (x = 4, 5; y = 0, 1) nanoclusters with methane have been explored in a ring-electrode ion trap under multicollision conditions and theoretically with the use of first-principles quantum simulations. At room tempera
Autor:
Karsten Reuter, Martin Tschurl, Harald Oberhofer, J. F. Eckhard, Chiara Panosetti, Ueli Heiz, D. Neuwirth
Publikováno v:
Physical Chemistry Chemical Physics. 19:5985-5993
The reaction of small cationic tantalum clusters (Tan+, n = 4-8) with molecular oxygen is studied under multi-collision conditions in the gas phase, and the reaction kinetics are analyzed in order to elucidate underlying mechanisms. Reaction pathways
Publikováno v:
Physical chemistry chemical physics : PCCP. 21(37)
Cationic tantalum carbenes [TaCH
Autor:
Martin Tschurl, Kathrin Lange, J. F. Eckhard, Ulrich Heiz, Tsugunosuke Masubuchi, Bradley Visser
Publikováno v:
The Review of scientific instruments. 89(2)
A laser vaporization cluster source that has a room for cluster aggregation and a reactor volume, each equipped with a pulsed valve, is presented for the efficient gas-phase production of chemically modified metal clusters. The performance of the clu
Autor:
Ueli Heiz, Martin Tschurl, Max Wiedemann, J. F. Eckhard, Daniel Neuwirth, Richard Schröter, Bradley Visser, Kathrin Lange
Publikováno v:
International Journal of Mass Spectrometry. 387:8-15
An experimental setup is presented, which consists of a laser vaporization cluster source, various ion optics for ion guidance, a quadrupole mass filter for mass selection, a ring electrode ion trap for ion storage and a reflectron time-of-flight mas
Autor:
Martin Tschurl, Kathrin Lange, Ulrich Boesl, Kit H. Bowen, Bradley Visser, J. F. Eckhard, Ueli Heiz, D. Neuwirth
Publikováno v:
International Journal of Mass Spectrometry. 375:9-13
Small tantalum cluster cations (Ta4–9+) were produced in the gas phase by laser vaporization. Various alcohols (methanol, ethanol, n-propanol and 2-propanol) were consecutively added to the cluster beam in a pulsed jet and allowed to react to an ex
Publikováno v:
Physical chemistry chemical physics : PCCP. 19(17)
Cationic tantalum clusters (Ta9-12+) are reacted with molecular oxygen under multi-collision conditions in the gas phase in order to analyze the reaction kinetics. Clusters in this transitional size regime demonstrate reaction pathways associated wit