Noble-metal dark-edge fermiology: Centrifugal barriers, core-hole memory, and the Zeeman Auger effect

2021 ◽  
Vol 104 (24) ◽  
Author(s):  
J. C. Woicik ◽  
E. L. Shirley ◽  
C. Weiland ◽  
A. K. Rumaiz ◽  
C. A. Cardot ◽  
...  
Keyword(s):  
Noble Metal ◽  
Core Hole ◽  
Auger Effect

VUV PHOTOELECTRON DYNAMICS IN PURE CESIUM HALIDE AND IMPURITY (Tl AND Na) DOPED CsI; ABSOLUTE PHOTOEMISSION TOTAL YIELD, AUGER FREE LUMINESCENCE, AND STE LUMINESCENCE

2002 ◽  
Vol 09 (01) ◽  
pp. 447-454
Author(s):  
ARISATO EJIRI ◽  
SHINZOU KUBOTA
Keyword(s):  
Room Temperature ◽  
Total Yield ◽  
Cesium Iodide ◽  
Decay Process ◽  
Temperature Dependent ◽  
Core Hole ◽  
Core Electron ◽  
Complementary Relation ◽  
Auger Effect ◽  
Excited Luminescence

Absolute photoemission total yield (APTY) spectra and VUV-excited luminescence in cesium halides of CsCl, CsBr, and CsI, as well as in Tl-doped and Na-doped cesium iodide, were studied at several temperatures from 400 K to 80 K in the VUV region (5–30 eV). Although it is common that the intensities of APTY exceed unity in the photon energy region exciting Cs + 5p core electron in all of these halides at room temperature, this is most in the cesium iodides and most less in CsCl. These phenomena are explained in terms of Auger enhancement due to the Auger effect associated with the decay process of the Cs + 5p core hole. From the detailed analysis of temperature dependence of APTY and of Auger free luminescence (AFL) in CsCl and CsBr, a strong complementary relation between APTY and AFL was revealed, and the temperature-dependent energy level diagram of CsBr including the valence band and the Cs + 5p core level was proposed. While in these CsI, APTY indicate as large as 1.5 or more at the high temperature and the decrease of APTY for decreasing temperature can be commonly explained in terms of the complementary relation with photoluminescence.

Analytical Electron Microscopy study of two vehicle-aged automotive exhaust catalysts having dissimilar activities

1989 ◽  
Vol 47 ◽  
pp. 272-273
Author(s):  
Sooho Kim ◽  
M. J. D’Aniello
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Noble Metal ◽  
Catalyst Deactivation ◽  
Analytical Electron Microscopy ◽  
Microscopy Study ◽  
Metal Particles ◽  
Automotive Exhaust ◽  
Exhaust Catalysts ◽  
Analytical Electron

Automotive catalysts generally lose-agtivity during vehicle operation due to several well-known deactivation mechanisms. To gain a more fundamental understanding of catalyst deactivation, the microscopic details of fresh and vehicle-aged commercial pelleted automotive exhaust catalysts containing Pt, Pd and Rh were studied by employing Analytical Electron Microscopy (AEM). Two different vehicle-aged samples containing similar poison levels but having different catalytic activities (denoted better and poorer) were selected for this study.The general microstructure of the supports and the noble metal particles of the two catalysts looks similar; the noble metal particles were generally found to be spherical and often faceted. However, the average noble metal particle size on the poorer catalyst (21 nm) was larger than that on the better catalyst (16 nm). These sizes represent a significant increase over that found on the fresh catalyst (8 nm). The activity of these catalysts decreases as the observed particle size increases.

Interlayer confinement synthesis of Ir nanodots/dual carbon as an electrocatalyst for overall water splitting

2020 ◽  
Author(s):  
Yaru Li ◽  
Yu-Quan Zhu ◽  
Weili Xin ◽  
Song Hong ◽  
Xiaoying Zhao ◽  
...  
Keyword(s):  
Water Splitting ◽  
Noble Metal ◽  
High Efficiency ◽  
Overall Water Splitting ◽  
Highly Dispersed

Rationally designing low-content and high-efficiency noble metal nanodots offers opportunities to enhance electrocatalytic performances for water splitting. However, the preparation of highly dispersed nanodots electrocatalysts remains a challenge. Herein, we...

CORE-HOLE SCREENING IN LIGHT RARE-EARTH INSULATING COMPOUNDS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-961-C8-964
Author(s):  
E. BEAUREPAIRE ◽  
F. LE NORMAND ◽  
G. KRILL
Keyword(s):  
Rare Earth ◽  
Light Rare Earth ◽  
Core Hole

The Auger effect in biology and medicine

2012 ◽  
Vol 51 (05) ◽  
pp. 161-162 ◽  
Author(s):  
L. E. Feinendegen
Keyword(s):  
Auger Effect
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