Gas-phase reactions of Si+ and SiOH+ with molecules containing hydroxyl groups: possible ion-molecule reaction pathways toward silicon monoxide, silanoic acid, and trihydroxy-, trimethoxy-, and triethoxysilane

1987 ◽  
Vol 109 (22) ◽  
pp. 6663-6667 ◽  
Author(s):  
S. Wlodek ◽  
A. Fox ◽  
D. K. Bohme
Keyword(s):  
Gas Phase ◽  
Silicon Monoxide ◽  
Reaction Pathways ◽  
Hydroxyl Groups ◽  
Gas Phase Reactions ◽  
Molecule Reaction

scholarly journals The formation of urea in space

2018 ◽  
Vol 610 ◽  
pp. A26 ◽  
Author(s):  
Flavio Siro Brigiano ◽  
Yannick Jeanvoine ◽  
Antonio Largo ◽  
Riccardo Spezia
Keyword(s):  
Activation Energy ◽  
Interstellar Medium ◽  
Gas Phase ◽  
Organic Molecules ◽  
Peptide Bond ◽  
Biological Molecules ◽  
Gas Phase Reactions ◽  
Molecule Reaction ◽  
Quantum Chemistry Calculations ◽  
Highly Correlated

Context. Many organic molecules have been observed in the interstellar medium thanks to advances in radioastronomy, and very recently the presence of urea was also suggested. While those molecules were observed, it is not clear what the mechanisms responsible to their formation are. In fact, if gas-phase reactions are responsible, they should occur through barrierless mechanisms (or with very low barriers). In the past, mechanisms for the formation of different organic molecules were studied, providing only in a few cases energetic conditions favorable to a synthesis at very low temperature. A particularly intriguing class of such molecules are those containing one N–C–O peptide bond, which could be a building block for the formation of biological molecules. Urea is a particular case because two nitrogen atoms are linked to the C–O moiety. Thus, motivated also by the recent tentative observation of urea, we have considered the synthetic pathways responsible to its formation. Aims. We have studied the possibility of forming urea in the gas phase via different kinds of bi-molecular reactions: ion-molecule, neutral, and radical. In particular we have focused on the activation energy of these reactions in order to find possible reactants that could be responsible for to barrierless (or very low energy) pathways. Methods. We have used very accurate, highly correlated quantum chemistry calculations to locate and characterize the reaction pathways in terms of minima and transition states connecting reactants to products. Results. Most of the reactions considered have an activation energy that is too high; but the ion-molecule reaction between NH2OHNH2OH2+ and formamide is not too high. These reactants could be responsible not only for the formation of urea but also of isocyanic acid, which is an organic molecule also observed in the interstellar medium.

Gas-Phase Reactions

1981 ◽  
Author(s):  
Victor N. Kondratiev ◽  
Evgeniĭ E. Nikitin
Keyword(s):  
Gas Phase ◽  
Gas Phase Reactions

Influence of Gas Mixing and Heating on Gas-Phase Reactions in GaN MOCVD Growth

2012 ◽  
Vol 1 (1) ◽  
pp. P46-P53 ◽  
Author(s):  
Ran Zuo ◽  
Haiqun Yu ◽  
Nan Xu ◽  
Xiaokun He
Keyword(s):  
Gas Phase ◽  
Gas Mixing ◽  
Gas Phase Reactions ◽  
Mocvd Growth

Gas Phase Reactions Activated by Nuclear Processes

1957 ◽  
Vol 79 (17) ◽  
pp. 4609-4616 ◽  
Author(s):  
Adon A. Gordus ◽  
John E. Willard
Keyword(s):  
Gas Phase ◽  
Gas Phase Reactions ◽  
Nuclear Processes
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