Gas-phase thermal decomposition of dimethyl mercury. Part 1.—The role of heterogeneous processes

1964 ◽  
Vol 60 (0) ◽  
pp. 93-102 ◽  
Author(s):  
A. S. Kallend ◽  
J. H. Purnell
Keyword(s):  
Thermal Decomposition ◽  
Gas Phase ◽  
Heterogeneous Processes

scholarly journals The role of radiolysis in the modelling of C2H4O2 isomers and dimethyl ether in cold dark clouds

2020 ◽  
Vol 500 (3) ◽  
pp. 3414-3424
Author(s):  
Alec Paulive ◽  
Christopher N Shingledecker ◽  
Eric Herbst
Keyword(s):  
Gas Phase ◽  
Dimethyl Ether ◽  
Recent Observation ◽  
Cosmic Ray ◽  
Thermal Method ◽  
Dark Clouds ◽  
Ice Surface ◽  
Dust Grain ◽  
Complex Organic

ABSTRACT Complex organic molecules (COMs) have been detected in a variety of interstellar sources. The abundances of these COMs in warming sources can be explained by syntheses linked to increasing temperatures and densities, allowing quasi-thermal chemical reactions to occur rapidly enough to produce observable amounts of COMs, both in the gas phase, and upon dust grain ice mantles. The COMs produced on grains then become gaseous as the temperature increases sufficiently to allow their thermal desorption. The recent observation of gaseous COMs in cold sources has not been fully explained by these gas-phase and dust grain production routes. Radiolysis chemistry is a possible non-thermal method of producing COMs in cold dark clouds. This new method greatly increases the modelled abundance of selected COMs upon the ice surface and within the ice mantle due to excitation and ionization events from cosmic ray bombardment. We examine the effect of radiolysis on three C2H4O2 isomers – methyl formate (HCOOCH3), glycolaldehyde (HCOCH2OH), and acetic acid (CH3COOH) – and a chemically similar molecule, dimethyl ether (CH3OCH3), in cold dark clouds. We then compare our modelled gaseous abundances with observed abundances in TMC-1, L1689B, and B1-b.

Synthesis of Sic Fine Particles by Gas-Phase Reaction Under Short-Time Microgravity

1992 ◽  
Vol 286 ◽  
Author(s):  
Takeshi Okutani ◽  
Yoshinori Nakata ◽  
Masaakt Suzuki ◽  
Yves Maniette ◽  
Nobuyoshi Goto ◽  
...  
Keyword(s):  
Thermal Decomposition ◽  
Heat Source ◽  
Size Distribution ◽  
Gas Phase ◽  
Fine Particles ◽  
Rapid Heating ◽  
Exothermic Reaction ◽  
Phase Reaction ◽  
Gas Phase Reaction ◽  
Short Time

ABSTRACTSiC fine particles were synthesized by the gas-phase thermal decomposition of tetramethylsilane (Si(CH3)4) in hydrogen under microgravity of 10−4G for 10 sec. Rapid heating to the temperature over 800°C which is required for thermal decomposition of Si(CH3)4) under short-time microgravity was attained using a chemical oven where the heat of exothermic reaction of combustion synthesis of Ti-A1-4B composites was used as the heat source. Monodisperse and spherical SiC fine particles were synthesized under microgravity, whereas aggregates of SiC fine particles were synthesized under 1 G gravity. The SiC particles synthesized under microgravity (150-200 nm) were bigger in size and narrower in size distribution than those under 1 G gravity (100-150 nm).

Role of solid- and gas-phase interactions in the coaction of the oxides in MnO2 + PbO and MnO2 + V2O5 compositions activating the thermal oxidation of GaAs

2007 ◽  
Vol 52 (10) ◽  
pp. 1498-1502 ◽  
Author(s):  
V. F. Kostryukov ◽  
V. R. Pshestanchik ◽  
I. A. Donkareva ◽  
B. L. Agapov ◽  
S. I. Lopatin ◽  
...  
Keyword(s):  
Thermal Oxidation ◽  
Gas Phase

Role of silver compounds in promoting the thermal decomposition of ammonium perchlorate

1986 ◽  
Vol 1 (3) ◽  
pp. 235-251 ◽  
Author(s):  
Andrew K. Galwey ◽  
Mohamed A. Mohamed ◽  
David S. Cromie
Keyword(s):  
Thermal Decomposition ◽  
Ammonium Perchlorate ◽  
Silver Compounds

The role of anhydrous zinc nitrate in the thermal decomposition of the zinc hydroxy nitrates Zn5(OH)8(NO3)2·2H2O and ZnOHNO3·H2O

2007 ◽  
Vol 180 (4) ◽  
pp. 1171-1179 ◽  
Author(s):  
Timothy Biswick ◽  
William Jones ◽  
Alexandra Pacuła ◽  
Ewa Serwicka ◽  
Jerzy Podobinski
Keyword(s):  
Thermal Decomposition ◽  
Zinc Nitrate
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