Results 101 to 110 of about 17,092 (265)
On the performance of UHV-ICEMS experiments
, 1990 Integral Conversion Electron Mössbauer Spectroscopy (ICEMS) when aimed at the study of clean surfaces in UHV often leads to unfavourable measuring geometry and consequently to long recording times.
Sauer, Ch. +5 more
core +1 more source
Angewandte Chemie International Edition, EarlyView.By combining polarization‐resolved IRRAS with hybrid HSE06 DFT calculations, we establish site‐specific vibrational fingerprints, adsorption geometries, and binding energies for CO on wide‐band‐gap MgO surfaces. Low‐coordinated Mg4c2+ step‐edge sites, rather than terrace Schottky defects, are identified as the dominant binding and reactive sites, with ...
Wangtao Li +9 more
wiley +1 more source
A Carbon-Induced Surface Reconstruction on an Operating Fischer-Tropsch Catalyst. [PDF]
Angew Chem Int Ed EnglIt is widely believed that a cobalt Fischer–Tropsch catalyst initially undergoes an activity‐enhancing roughening, driven by the high chemical potential of carbon. In this operando STM and DFT study, we simulate such conditions. We show that, instead, a triangular stacking‐fault reconstruction may form, leaving the catalytic activity unchanged ...
Kläger S +3 more
europepmc +2 more sources
Abnormal steady-state overvoltage in transmission lines of UHV [PDF]
, 2012 The reason of overvoltage at the abnormal conditions in transmission lines of UHV are researched. The source of parameters distortion which causes specific overvoltage under at the open-phase operating conditions of transmission lines is given.
Кучанський, В.В. +2 more
core +1 more source
Angewandte Chemie International Edition, EarlyView.Under ambient conditions, the TiO2 surface becomes hydrated by adsorbed hydroxyl groups (OH) and water molecules. This surface hydration promotes methanol decomposition, rendering the first deprotonation step nearly barrierless compared with ideal UHV conditions.
Milad Salarinasab +12 more
wiley +1 more source
Structural and Chemical Dynamics of Cu/NiO/Cu(100) Surfaces During CO2 Hydrogenation
Angewandte Chemie International Edition, EarlyView.Dynamic segregation as a design principle for Cu–Ni catalysts. Operando LEEM/XPEEM tracks reduction, reshaping, and surface segregation processes taking place in Cu‐encapsulated NiO islands supported on Cu(100) during CO2 hydrogenation. ABSTRACT Understanding the dynamic restructuring of bimetallic catalysts under reaction conditions is key to ...
Mauricio J. Prieto +9 more
wiley +1 more source
In this document the state of art of UHV connectors is analyzed and the main factors such as geometry, corona and bundle among others are ...
Hernández Guiteras, Joan +1 more
core
, 1961 Einleitung: Im Jahre 1953 gab Alpert eine Kupferfolienfalle für Öldiffusionspumpsysteme an, mit der es möglich ist, das Endvakuum für eineige Wochen unter 10-9 Torr zu halten. Nach dieser stay-down-Zeit steigt der Druck ziemlich schnell auf einige 10-8 Torr, den "Dampfdruck" des Treibmittels, an.
openaire +2 more sources
Evaluation of Zr-V-Fe getter pump for uhv system [PDF]
, 1982 The nonevaporable getter pump St707 (Zr-V-Fe) from SAES Getters, Inc. may be activated and operated at lower temperatures. However, its application to a UHV system has not been reported yet.
Hseuh, H. C., Lanni, C.
core
Self‐Assembled Telecom Color Centers in Silicon and Their Growth Environment
Advanced Physics Research, EarlyView.Influence of the growth pressure during the formation of self‐assembled color centers in silicon grown by molecular beam epitaxy at ultra‐low temperatures on the color center's photoluminescence spectral signature. The growth pressure crucially determines color center selectivity, as evidenced by G‐centers, W‐centers, and T‐centers, matrix purity, and ...
Jacqueline Marböck +9 more
wiley +1 more source