Metasomatism of peridotite by alkaline melt and cognate fluid: microchemical and ion-probe evidence from the low-P Inagli dunite

2019 ◽  
Keyword(s):  
Ion Probe

Fluidized Catalytic Cracking Catalyst Microstructure as Determined by A Scanning Ion Microprobe

1990 ◽  
Vol 48 (2) ◽  
pp. 302-303
Author(s):  
J.K. Lampert ◽  
G.S. Koermer ◽  
J.M. Macaoy ◽  
J.M. Chabala ◽  
R. Levi-Setti
Keyword(s):  
Catalytic Cracking ◽  
Secondary Ion Mass Spectrometry ◽  
Fuel Oil ◽  
Ion Microprobe ◽  
Fluidized Catalytic Cracking ◽  
Ion Probe ◽  
Silica Alumina ◽  
Resolution Imaging ◽  
The University ◽  
High Spatial Resolution Imaging

We have used high spatial resolution imaging secondary ion mass spectrometry (SIMS) to differentiate mineralogical phases and to investigate chemical segregations in fluidized catalytic cracking (FCC) catalyst particles. The oil industry relies on heterogeneous catalysis using these catalysts to convert heavy hydrocarbon fractions into high quality gasoline and fuel oil components. Catalyst performance is strongly influenced by catalyst microstructure and composition, with different chemical reactions occurring at specific types of sites within the particle. The zeolitic portions of the particle, where the majority of the oil conversion occurs, can be clearly distinguished from the surrounding silica-alumina matrix in analytical SIMS images.The University of Chicago scanning ion microprobe (SIM) employed in this study has been described previously. For these analyses, the instrument was operated with a 40 keV, 10 pA Ga+ primary ion probe focused to a 30 nm FWHM spot. Elemental SIMS maps were obtained from 10×10 μm2 areas in times not exceeding 524s.

Restriction of Access to Dark State: A New Mechanistic Model for Heteroatom-Containing AIE Systems

2019 ◽  
Author(s):  
Yujie Tu ◽  
Junkai Liu ◽  
Haoke Zhang ◽  
Qian Peng ◽  
Jacky W. Y. Lam ◽  
...  
Keyword(s):  
Excited States ◽  
Radiative Decay ◽  
Molecular Design ◽  
Mechanistic Model ◽  
Zinc Ion ◽  
Easy Access ◽  
Triplet States ◽  
Dark State ◽  
Ion Probe ◽  
Π State

Aggregation-induced emission (AIE) is an unusual photophysical phenomenon and provides an effective and advantageous strategy for the design of highly emissive materials in versatile applications such as sensing, imaging, and theragnosis. "Restriction of intramolecular motion" is the well-recognized working mechanism of AIE and have guided the molecular design of most AIE materials. However, it sometimes fails to be workable to some heteroatom-containing systems. Herein, in this work, we take more than one excited state into account and specify a mechanism –"restriction of access to dark state (RADS)" – to explain the AIE effect of heteroatom-containing molecules. An anthracene-based zinc ion probe named APA is chosen as the model compound, whose weak fluorescence in solution is ascribed to the easy access from the bright (π,π*) state to the closelying dark (n,π*) state caused by the strong vibronic coupling of the two excited states. By either metal complexation or aggregation, the dark state is less accessible due to the restriction of the molecular motion leading to the dark state and elevation of the dark state energy, thus the emission of the bright state is restored. RADS is found to be powerful in elucidating the photophysics of AIE materials with excited states which favor non-radiative decay, including overlap-forbidden states such as (n,π*) and CT states, spin-forbidden triplet states, which commonly exist in heteroatom-containing molecules.

Investigation of the measurement characteristics of a multiple-ion-probe method for a propagating methane–oxygen–nitrogen flame

2020 ◽  
Vol 211 ◽  
pp. 112-123
Author(s):  
Tomoaki Yatsufusa ◽  
Keigo Kii ◽  
Naoya Miura ◽  
Hiroki Yamamoto ◽  
Akira Kawasaki ◽  
...  
Keyword(s):  
Probe Method ◽  
Ion Probe

Ion probe dating of the Achab Gneiss, a young basement to the Central Bushmanland Ore District?

2007 ◽  
Vol 47 (2) ◽  
pp. 112-116 ◽  
Author(s):  
David H. Cornell ◽  
Åsa Pettersson
Keyword(s):  
Ion Probe ◽  
Ore District

Mercury-chlorine exchange rates in chloride ion probe experiments

1974 ◽  
Vol 16 (2) ◽  
pp. 220-227 ◽  
Author(s):  
Ming Man ◽  
Robert G Bryant
Keyword(s):  
Exchange Rates ◽  
Chloride Ion ◽  
Ion Probe

The gas ion probe: A novel instrument for analyzing concentration profiles of gases in solids

1979 ◽  
Vol 29 (2) ◽  
pp. 87-100 ◽  
Author(s):  
J. Kiko ◽  
H.W. Müller ◽  
K. Büchler ◽  
S. Kalbitzer ◽  
T. Kirsten ◽  
...  
Keyword(s):  
Concentration Profiles ◽  
Ion Probe

High-latitude irregularities in the top side ionosphere based on Isis 1 Thermal Ion Probe data

1974 ◽  
Vol 79 (28) ◽  
pp. 4252-4261 ◽  
Author(s):  
R. C. Sagalyn ◽  
M. Smiddy ◽  
M. Ahmed
Keyword(s):  
High Latitude ◽  
Ion Probe
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