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 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.

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.

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 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

scholarly journals Monte Carlo simulation for soot dynamics

2012 ◽  
Vol 16 (5) ◽  
pp. 1391-1394 ◽  
Author(s):  
Kun Zhou
Keyword(s):  
Particle Size ◽  
Monte Carlo ◽  
Particle Size Distribution ◽  
Size Distribution ◽  
Gas Phase ◽  
Volume Fraction ◽  
Soot Formation ◽  
Bimodal Distribution ◽  
Number Density ◽  
Stochastic Error

A new Monte Carlo method termed Comb-like frame Monte Carlo is developed to simulate the soot dynamics. Detailed stochastic error analysis is provided. Comb-like frame Monte Carlo is coupled with the gas phase solver Chemkin II to simulate soot formation in a 1-D premixed burner stabilized flame. The simulated soot number density, volume fraction, and particle size distribution all agree well with the measurement available in literature. The origin of the bimodal distribution of particle size distribution is revealed with quantitative proof.

scholarly journals NAT-rock formation by mother clouds: a microphysical model study

2002 ◽  
Vol 2 (2) ◽  
pp. 93-98 ◽  
Author(s):  
S. Fueglistaler ◽  
B.P. Luo ◽  
C. Voigt ◽  
K.S. Carslaw ◽  
Th. Peter
Keyword(s):  
Particle Size ◽  
Nitric Acid ◽  
Particle Size Distribution ◽  
Gas Phase ◽  
Cloud Base ◽  
Number Density ◽  
Monodisperse Particle ◽  
Model Study ◽  
Rock Mechanism ◽  
Stratospheric Clouds

Abstract. Polar stratospheric clouds (PSCs) of type 1a or 1a-enh containing high number densities of nitric acid trihydrate (NAT) particles, can act as mother clouds for extremely large NAT particles, termed NAT-rocks, provided the air below the clouds is supersaturated with respect to NAT. Individual NAT particles at the cloud base fall into undepleted gas phase and rapidly accelerate due to a positive feedback between their growth and sedimentation. The resulting reduction in number density is further enhanced by the strong HNO3 depletion within a thin layer below the mother cloud, which delays subsequent particles. This paper introduces the basic microphysical principles behind this mother cloud/NAT-rock mechanism, which produces 10-4 cm-3 NAT-rocks with radii around 10 mm some kilometers below the mother cloud. The mechanism does not require selective nucleation and works even for a monodisperse particle size distribution in the mother cloud.

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