Experimental and Modeling Studies of B Atom Number Density Distributions in Hot Filament Activated B2H6/H2and B2H6/CH4/H2Gas Mixtures†

2006 ◽  
Vol 110 (9) ◽  
pp. 2868-2875 ◽  
Author(s):  
Dane W. Comerford ◽  
Andrew Cheesman ◽  
Thomas P. F. Carpenter ◽  
David M. E. Davies ◽  
Neil A. Fox ◽  
...  
Keyword(s):  
Number Density ◽  
Atom Number ◽  
Density Distributions ◽  
Modeling Studies ◽  
Atom Number Density ◽  
Hot Filament

scholarly journals Application of Laser-Enhanced Ionization: Atomization Efficiency Determination

1992 ◽  
Vol 46 (9) ◽  
pp. 1370-1375 ◽  
Author(s):  
King-Dow Su ◽  
King-Chuen Lin ◽  
Wei-Tzou Luh
Keyword(s):  
Free Atom ◽  
Number Density ◽  
Atom Number ◽  
Metal Elements ◽  
Atomization Efficiency ◽  
Atom Number Density ◽  
Efficiency Determination

We have demonstrated that the laser-enhanced ionization (LEI) technique can be used to determine the efficiency of atomization of metal elements in an atmospheric acetylene/air flame. We have derived a useful relation between the time-integrated LEI signal and the total free atom number density in a flame. We determine the efficiency of atomization of ∼0.13–0.37 for the lithium element and of ∼1.0 for the sodium element. Our results agree well with AA measurements reported previously.

scholarly journals Investigation of the on-axis atom number density in the supersonic gas jet under high gas backing pressure by simulation

AIP Advances ◽  
2015 ◽  
Vol 5 (10) ◽  
pp. 107220 ◽  
Author(s):  
Guanglong Chen ◽  
A. S. Boldarev ◽  
Xiaotao Geng ◽  
Yi Xu ◽  
Yunjiu Cao ◽  
...  
Keyword(s):  
Gas Jet ◽  
Number Density ◽  
Atom Number ◽  
Backing Pressure ◽  
Atom Number Density ◽  
Supersonic Gas Jet

Quantification of Gas-Phase H-Atom Number Density by Tungsten Phosphate Glass

2005 ◽  
Vol 44 (1B) ◽  
pp. 732-735 ◽  
Author(s):  
Takashi Morimoto ◽  
Hironobu Umemoto ◽  
Koji Yoneyama ◽  
Atsushi Masuda ◽  
Hideki Matsumura ◽  
...  
Keyword(s):  
Gas Phase ◽  
Phosphate Glass ◽  
Number Density ◽  
Atom Number ◽  
Atom Number Density

scholarly journals A new Description of Probability Density Distributions of Polar Mesospheric Clouds (PMC)

2018 ◽  
Author(s):  
Uwe Berger ◽  
Gerd Baumgarten ◽  
Jens Fiedler ◽  
Franz-Josef Lübken
Keyword(s):  
Probability Density ◽  
Mass Density ◽  
Particle Radius ◽  
Number Density ◽  
Data Set ◽  
Statistical Probability ◽  
Polar Mesospheric Clouds ◽  
Density Distributions ◽  
Mesospheric Clouds ◽  
Probability Density Distributions

Abstract. In this paper we present a new description about statistical probability density distributions (pdfs) of Polar Mesospheric Clouds (PMC) and noctilucent clouds (NLC). The analysis is based on observations of maximum backscatter, ice mass density, ice particle radius, and number density of ice particles measured by the ALOMAR RMR-lidar for all NLC seasons from 2002 to 2016. From this data set we derive a new class of pdfs that describe the statistics of PMC/NLC events which is different from previously statistical methods using the approach of an exponential distribution commonly named g-distribution. The new analysis describes successfully the probability statistic of ALOMAR lidar data. It turns out that the former g-function description is a special case of our new approach. In general the new statistical function can be applied to many kinds of different PMC parameters, e.g. maximum backscatter, integrated backscatter, ice mass density, ice water content, ice particle radius, ice particle number density or albedo measured by satellites. As a main advantage the new method allows to connect different observational PMC distributions of lidar, and satellite data, and also to compare with distributions from ice model studies. In particular, the statistical distributions of different ice parameters can be compared with each other on the basis of a common assessment that facilitate, for example, trend analysis of PMC/NLC.

scholarly journals Structures and number-density distributions in clusters of galaxies

1978 ◽  
Vol 79 ◽  
pp. 198-199
Author(s):  
F. W. Baier
Keyword(s):  
Clusters Of Galaxies ◽  
Number Density ◽  
Multiple Systems ◽  
Preliminary Results ◽  
Density Distributions ◽  
Sky Survey

I would like to present some preliminary results of an investigation of 50 clusters of galaxies. For studying the clusters, Schmidt plates taken with the 2-metre universal telescope at Tautenburg and the prints of the Palomar Sky Survey were used. For all the clusters we determined isopleths to obtain detailed information about the distribution of galaxies. We have found well isolated clusters, double clusters, multiple systems and rather complicated structures.

scholarly journals Gas-Phase Silicon Atom Densities in the Chemical Vapor Deposition of Silicon from Silane

1993 ◽  
Vol 334 ◽  
Author(s):  
Michael E. Coltrin ◽  
William G. Breiland ◽  
Pauline Ho
Keyword(s):  
Chemical Vapor Deposition ◽  
Gas Phase ◽  
Silicon Atom ◽  
Vapor Deposition ◽  
Chemical Vapor ◽  
Rotating Disk ◽  
Number Density ◽  
Atom Number ◽  
Density Profiles ◽  
Calculated Density

AbstractSilicon atom number density profiles have been measured using laser-induced fluorescence during the chemical vapor deposition of silicon from silane. Measurements were obtained in a rotating-disk reactor as a function of silane partial pressure and the amount of hydrogen added to the carrier gas. Absolute number densities were obtained using an atomic absorption technique. Results were compared with calculated density profiles from a model of the coupled fluid flow, gas-phase and surface chemistry for an infinite-radius rotating disk. An analysis of the reaction mechanism showed that the unimolecular decomposition of SiH2 is not the dominant source of Si atoms. Profile shapes and positions, and all experimental trends are well matched by the calculations. However, the calculated number density is up to 100 times smaller than measured.

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