Theoretical and Experimental Study of the Gas-Phase Reactions of PFn+(n= 1, 2) Ions with n-Bases. A Novel Route to Phosphorus Ions Present in Interstellar Clouds§

1997 ◽  
Vol 36 (18) ◽  
pp. 3936-3946 ◽  
Author(s):  
Antonello Filippi ◽  
Giorgio Occhiucci ◽  
Maurizio Speranza
Keyword(s):  
Experimental Study ◽  
Gas Phase ◽  
Gas Phase Reactions ◽  
Interstellar Clouds

An experimental study of the reactivity of the hydroxide anion in the gas phase at room temperature, and its perturbation by hydration

1981 ◽  
Vol 59 (11) ◽  
pp. 1615-1621 ◽  
Author(s):  
Scott D. Tanner ◽  
Gervase I. Mackay ◽  
Diethard K. Bohme
Keyword(s):  
Experimental Study ◽  
Proton Transfer ◽  
Gas Phase ◽  
Rate Constants ◽  
Room Temperature ◽  
Gas Phase Reactions ◽  
Flowing Afterglow ◽  
Hydroxide Anion

Flowing afterglow measurements are reported which provide rate constants and product identifications at 298 ± 2 K for the gas-phase reactions of OH− with CH3OH, C2H5OH, CH3OCH3, CH2O, CH3CHO, CH3COCH3, CH2CO, HCOOH, HCOOCH3, CH2=C=CH2, CH3—C≡CH, and C6H5CH3. The main channels observed were proton transfer and solvation of the OH−. Hydration with one molecule of H2O was observed either to reduce the rate slightly and lead to products which are the hydrated analogues of the "nude" reaction, or to stop the reaction completely, k ≤ 10−12 cm3 molecule−1 s−1. The reaction of OH−•H2O with CH3—C≡CH showed an uncertain intermediate behaviour.

An experimental study of the gas-phase reactions of the NO3 radical with three sesquiterpenes: isolongifolene, alloisolongifolene, and α-neoclovene

1999 ◽  
Vol 1 (12) ◽  
pp. 2929-2933 ◽  
Author(s):  
Carlos E. Canosa-Mas ◽  
Martin D. King ◽  
Phillip J. Scarr ◽  
Katherine C. Thompson ◽  
Richard P. Wayne
Keyword(s):  
Experimental Study ◽  
Gas Phase ◽  
Gas Phase Reactions ◽  
No3 Radical

scholarly journals Astrochemistry of Interstellar Clouds: II. Molecular Formation in a Contracting Cloud

1987 ◽  
Vol 120 ◽  
pp. 273-274
Author(s):  
M.A. El Shalaby ◽  
A. Aiad
Keyword(s):  
Gas Phase ◽  
Optical Depth ◽  
Chemical Reactions ◽  
Particle Density ◽  
Interstellar Cloud ◽  
Gas Phase Reactions ◽  
Interstellar Clouds ◽  
Continous Function ◽  
Molecular Formation ◽  
Self Gravity

The chemistry of an 667 Mo interstellar cloud was studied using 142 reactions for 40 species during the contraction under self gravity in two steps. At first the contraction is allowed without gas phase reactions untill certain optical depth is reached. Secondly, at this optical depth the chemical reactions are started for sufficient cycles in a time dependant scheme till only very small additionally changes in the abundances occur. The so obtained, relative abundances and coulmn densities for different species represent a continous function of the optical depths. The values arround τ=6.3 represent the observations for H2, H2+, H3+, OH, OH+, CH, CH+, CH2, CH2+, CH3+, H2O and H3O+. The region of τ between 1 and 5 i.e. of particle density between 4 102–6 103 is the preferable formation place for the majority of molecules.

An Experimental Study of the Gas-Phase Reactions of NO3 Radicals with a Series of Unsaturated Aldehydes: trans-2-Hexenal, trans-2-Heptenal, and trans-2-Octenal

2012 ◽  
Vol 116 (41) ◽  
pp. 10135-10142 ◽  
Author(s):  
Jamila Kerdouci ◽  
Bénédicte Picquet-Varrault ◽  
Régine Durand-Jolibois ◽  
Cécile Gaimoz ◽  
Jean-François Doussin
Keyword(s):  
Experimental Study ◽  
Gas Phase ◽  
Gas Phase Reactions ◽  
Unsaturated Aldehydes

scholarly journals Gas-phase prebiotic chemistry in extraterrestrial environments

2009 ◽  
Vol 5 (H15) ◽  
pp. 682-683 ◽  
Author(s):  
Nadia Balucani
Keyword(s):  
Gas Phase ◽  
Gas Phase Reactions ◽  
Chemical Modeling ◽  
Elementary Reactions ◽  
Interstellar Clouds ◽  
Neutral Gas ◽  
Prebiotic Molecules ◽  
Complex Chemistry ◽  
Cometary Comae

AbstractA variety of molecular species up to complex polyatomic molecules/radicals have been identified in many extraterrestrial gaseous environments, including interstellar clouds, cometary comae and planetary atmospheres. Amongst the identified molecules/radicals, a large percentage are organic in nature and encompass also prebiotic molecules. Different types of microscopic processes are believed to be involved in their formation, including surface processes, ion- and radical- molecule reactions. A thorough characterization of such a complex chemistry relies on a multi-disciplinary approach, where the observations are complemented by accurate chemical modeling. Unfortunately, a literature survey reveals that only a small percentage of the elementary reactions considered in the available models have been characterized in laboratory experiments. In this contribution, a brief overview will be given of recent experimental techniques that have allowed us to reach a better description of neutral-neutral gas-phase reactions, which might be responsible for the formation of simple prebiotic molecules.

An experimental study of the gas-phase reactions of the NO3 radical with pent-1-ene, hex-1-ene and hept-1-ene

1999 ◽  
Vol 1 (11) ◽  
pp. 2681-2685 ◽  
Author(s):  
Carlos E. Canosa-Mas ◽  
Martin D. King ◽  
Liam McDonnell ◽  
Richard P. Wayne
Keyword(s):  
Experimental Study ◽  
Gas Phase ◽  
Gas Phase Reactions ◽  
No3 Radical

scholarly journals Theoretical Studies of Dense Cloud Chemistry

1987 ◽  
Vol 120 ◽  
pp. 235-244 ◽  
Author(s):  
Eric Herbst
Keyword(s):  
Gas Phase ◽  
Low Temperatures ◽  
Rate Coefficients ◽  
Theoretical Studies ◽  
Cloud Chemistry ◽  
Physical Processes ◽  
Gas Phase Reactions ◽  
Interstellar Clouds ◽  
Molecular Abundances ◽  
Quantitative Calculations

Based on analyses by a variety of investigators, it has become understood that gas phase reactions can account for much of the chemistry observed in dense interstellar clouds. However, quantitative calculations of molecular abundances utilizing gas phase reactions are beset with difficulties. These difficulties include uncertainties in needed rate coefficients at the low temperatures of interstellar clouds, uncertainties in the dynamics of physical processes such as cloud collapse and clumping, and uncertainties in our understanding of gasgrain interactions. New work in some of these areas and its impact on modelling is emphasized.

Gas-Phase Reactions

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