scholarly journals Structural Bifurcation of Microwave Helium Jet Discharge at Atmospheric Pressure

2008 ◽  
Vol 3 ◽  
pp. 012-012 ◽  
Author(s):  
Shuichi TAKAMURA ◽  
Masakazu KITOH ◽  
Tadasuke SOGA ◽  
Hiroyoshi TAKASHIMA ◽  
Yuji NISHINO ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Helium Jet ◽  
Structural Bifurcation

Investigation on streamers propagating into a helium jet in air at atmospheric pressure: Electrical and optical emission analysis

2013 ◽  
Vol 114 (10) ◽  
pp. 103304 ◽  
Author(s):  
K. Gazeli ◽  
P. Svarnas ◽  
P. Vafeas ◽  
P. K. Papadopoulos ◽  
A. Gkelios ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Optical Emission ◽  
Emission Analysis ◽  
Helium Jet

Coupling of cold vapor generation with an atmospheric pressure glow microdischarge sustained between a miniature flow helium jet and a flowing liquid cathode for the determination of mercury by optical emission spectrometry

2014 ◽  
Vol 29 (5) ◽  
pp. 893-902 ◽  
Author(s):  
Krzysztof Greda ◽  
Piotr Jamroz ◽  
Pawel Pohl
Keyword(s):  
Emission Line ◽  
Atmospheric Pressure ◽  
Optical Emission ◽  
Emission Spectrometry ◽  
Vapor Generation ◽  
Flowing Liquid ◽  
Liquid Cathode ◽  
Cold Vapor Generation ◽  
Helium Jet

Introduction of Hg vapor to μAPGD formed between a miniature He flow microjet and a flowing liquid cathode resulted in a significant improvement of the sensitivity of the Hg I 253.7 nm emission line and a sub-ppb DL of Hg.

Correlation of phase resolved current, emission and surface charge measurements in an atmospheric pressure helium jet

2015 ◽  
Vol 71 (2) ◽  
pp. 20808 ◽  
Author(s):  
Torsten Gerling ◽  
Robert Wild ◽  
Andrei Vasile Nastuta ◽  
Christian Wilke ◽  
Klaus-Dieter Weltmann ◽  
...  
Keyword(s):  
Surface Charge ◽  
Atmospheric Pressure ◽  
Helium Jet ◽  
Current Emission

A High-Voltage Terminal for a Field-Emission Gun

1972 ◽  
Vol 30 ◽  
pp. 428-429
Author(s):  
N. F. Ziegler
Keyword(s):  
Field Emission ◽  
High Voltage ◽  
Atmospheric Pressure ◽  
Power Supplies ◽  
High Coherence

A high-voltage terminal has been constructed for housing the various power supplies and metering circuits required by the field-emission gun (described elsewhere in these Proceedings) for the high-coherence microscope. The terminal is cylindrical in shape having a diameter of 14 inches and a length of 24 inches. It is completely enclosed by an aluminum housing filled with Freon-12 gas at essentially atmospheric pressure. The potential of the terminal relative to ground is, of course, equal to the accelerating potential of the microscope, which in the present case, is 150 kilovolts maximum.

Electron microscope characterization of MOCVD-grown gap layers on Si

1986 ◽  
Vol 44 ◽  
pp. 724-725
Author(s):  
K.M. Jones ◽  
M.M. Al-Jassim ◽  
J.M. Olson
Keyword(s):  
Atmospheric Pressure ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Organic Chemical ◽  
Lattice Match ◽  
Si Substrates ◽  
Metal Organic ◽  
Good Lattice ◽  
Antiphase Domains

The epitaxial growth of III-V semiconductors on Si for integrated optoelectronic applications is currently of great interest. GaP, with a lattice constant close to that of Si, is an attractive buffer between Si and, for example, GaAsP. In spite of the good lattice match, the growth of device quality GaP on Si is not without difficulty. The formation of antiphase domains, the difficulty in cleaning the Si substrates prior to growth, and the poor layer morphology are some of the problems encountered. In this work, the structural perfection of GaP layers was investigated as a function of several process variables including growth rate and temperature, and Si substrate orientation. The GaP layers were grown in an atmospheric pressure metal organic chemical vapour deposition (MOCVD) system using trimethylgallium and phosphine in H2. The Si substrates orientations used were (100), 2° off (100) towards (110), (111) and (211).

Microstructure and reactivity of small metal particles: The role of Ce additives

1992 ◽  
Vol 50 (1) ◽  
pp. 318-319
Author(s):  
L.D. Schmidt ◽  
K. R. Krause ◽  
J. M. Schwartz ◽  
X. Chu
Keyword(s):  
Atmospheric Pressure ◽  
Noble Metals ◽  
Mixed Oxides ◽  
Catalytic Properties ◽  
Chemical Shifts ◽  
Catalytic Converter ◽  
Structural Evolution ◽  
Single Particles ◽  
Small Metal Particles

The evolution of microstructures of 10- to 100-Å diameter particles of Rh and Pt on SiO2 and Al2O3 following treatment in reducing, oxidizing, and reacting conditions have been characterized by TEM. We are able to transfer particles repeatedly between microscope and a reactor furnace so that the structural evolution of single particles can be examined following treatments in gases at atmospheric pressure. We are especially interested in the role of Ce additives on noble metals such as Pt and Rh. These systems are crucial in the automotive catalytic converter, and rare earths can significantly modify catalytic properties in many reactions. In particular, we are concerned with the oxidation state of Ce and its role in formation of mixed oxides with metals or with the support. For this we employ EELS in TEM, a technique uniquely suited to detect chemical shifts with ∼30Å resolution.

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