A Chemical Study of Photo-CVD of Silicon Nitride in Mercury-Sensitized Reactions Between Silane and Ammonia

1987 ◽  
Vol 101 ◽  
Author(s):  
Ching-Hsong Wu
Keyword(s):  
Silicon Nitride ◽  
Gas Phase ◽  
Isotope Labeling ◽  
Chemical Study ◽  
Chemical Processes ◽  
Chemical Characteristics ◽  
Experimental Conditions ◽  
Transient Intermediates ◽  
Labeling Method ◽  
Phase Chemical

ABSTRACTA photochemical system of mercury-sensitized reactions between silane and ammonia was studied to elucidate the gas-phase chemical processes involved in photo-CVD of silicon nitride. Several transient intermediates were detected and identified as silylated amines by the mass spectrometric isotope labeling method. These compounds containing both Si and N atoms appeared to be the precursors of silicon nitride. The chemical characteristics of silylated amines were studied under different experimental conditions. The reactivity and possible reaction paths for the formation of silylamine are discussed.

scholarly journals Low Temperature Experiments on Gas-Phase Chemical Processes

2000 ◽  
Vol 197 ◽  
pp. 237-250 ◽  
Author(s):  
B. R. Rowe ◽  
C. Rebrion Rowe ◽  
A. Canosa
Keyword(s):  
Low Temperature ◽  
Reaction Kinetics ◽  
Gas Phase ◽  
Low Temperatures ◽  
Chemical Processes ◽  
Experimental Results ◽  
Phase Chemical

A review of the most recent experimental results concerning reaction kinetics at low temperatures is presented, most of them having been obtained using the CRESU technique. Some astrochemical consequences are also highlighted.

scholarly journals Gas-phase chemical characteristics of Asian emission plumes observed during ITCT 2K2 over the eastern North Pacific Ocean

2004 ◽  
Vol 109 (D23) ◽  
Author(s):  
J. B. Nowak ◽  
D. D. Parrish ◽  
J. A. Neuman ◽  
J. S. Holloway ◽  
O. R. Cooper ◽  
...  
Keyword(s):  
Pacific Ocean ◽  
Gas Phase ◽  
North Pacific ◽  
North Pacific Ocean ◽  
Chemical Characteristics ◽  
Phase Chemical

2-Deoxyribose Radicals in the Gas Phase and Aqueous Solution. Transient Intermediates of Hydrogen Atom Abstraction from 2-Deoxyribofuranose

2005 ◽  
Vol 70 (11) ◽  
pp. 1769-1786 ◽  
Author(s):  
Luc A. Vannier ◽  
Chunxiang Yao ◽  
František Tureček
Keyword(s):  
Aqueous Solution ◽  
Hydrogen Atom ◽  
Gas Phase ◽  
Computational Study ◽  
Hydrogen Atom Abstraction ◽  
Oh Radical ◽  
Free Energies ◽  
Intramolecular Hydrogen ◽  
Solvation Free Energies ◽  
Transient Intermediates

A computational study at correlated levels of theory is reported to address the structures and energetics of transient radicals produced by hydrogen atom abstraction from C-1, C-2, C-3, C-4, C-5, O-1, O-3, and O-5 positions in 2-deoxyribofuranose in the gas phase and in aqueous solution. In general, the carbon-centered radicals are found to be thermodynamically and kinetically more stable than the oxygen-centered ones. The most stable gas-phase radical, 2-deoxyribofuranos-5-yl (5), is produced by H-atom abstraction from C-5 and stabilized by an intramolecular hydrogen bond between the O-5 hydroxy group and O-1. The order of radical stabilities is altered in aqueous solution due to different solvation free energies. These prefer conformers that lack intramolecular hydrogen bonds and expose O-H bonds to the solvent. Carbon-centered deoxyribose radicals can undergo competitive dissociations by loss of H atoms, OH radical, or by ring cleavages that all require threshold dissociation or transition state energies >100 kJ mol-1. This points to largely non-specific dissociations of 2-deoxyribose radicals when produced by exothermic hydrogen atom abstraction from the saccharide molecule. Oxygen-centered 2-deoxyribose radicals show only marginal thermodynamic and kinetic stability and are expected to readily fragment upon formation.

scholarly journals A dual-isotope-labeling method of studying the bioavailability of hexaglutamyl folic acid relative to that of monoglutamyl folic acid in humans by using multiple orally administered low doses

2006 ◽  
Vol 84 (5) ◽  
pp. 1128-1133 ◽  
Author(s):  
Alida Melse-Boonstra ◽  
Petra Verhoef ◽  
Clive E West ◽  
Johannes A van Rhijn ◽  
Richard B van Breemen ◽  
...  
Keyword(s):  
Folic Acid ◽  
Isotope Labeling ◽  
Low Doses ◽  
Dual Isotope ◽  
Labeling Method

ChemInform Abstract: GAS PHASE CHEMICAL EQUILIBRIUM IN DINITROGEN TRIOXIDE AND DINITROGEN TETROXIDE

1975 ◽  
Vol 6 (7) ◽  
pp. no-no
Author(s):  
JING CHAO ◽  
RANDOLPH C. WILHOIT ◽  
BRUNO J. ZWOLINSKI
Keyword(s):  
Gas Phase ◽  
Chemical Equilibrium ◽  
Dinitrogen Tetroxide ◽  
Phase Chemical

Synthesis of polymorphic titanium oxide nanoparticles by a rapid gas-phase chemical reaction

2016 ◽  
Vol 26 (2) ◽  
pp. 157-159 ◽  
Author(s):  
Ning Luo ◽  
Hong Wen Jing ◽  
Zhan Guo Ma ◽  
Weidong Liu ◽  
Liangchi Zhang ◽  
...  
Keyword(s):  
Gas Phase ◽  
Titanium Oxide ◽  
Chemical Reaction ◽  
Oxide Nanoparticles ◽  
Titanium Oxide Nanoparticles ◽  
Phase Chemical

XPS analysis of NH3 plasma-treated polystyrene films utilizing gas phase chemical modification

1988 ◽  
Vol 26 (2) ◽  
pp. 559-572 ◽  
Author(s):  
Youichi Nakayama ◽  
Takayuki Takahagi ◽  
Fusami Soeda ◽  
Kenji Hatada ◽  
Shoji Nagaoka ◽  
...  
Keyword(s):  
Chemical Modification ◽  
Gas Phase ◽  
Xps Analysis ◽  
Phase Chemical
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