scholarly journals Theoretical Studies of Interstellar Isomers

1987 ◽  
Vol 120 ◽  
pp. 203-204
Author(s):  
D. J. DeFrees
Keyword(s):  
Molecular Cloud ◽  
Theoretical Studies ◽  
Cloud Chemistry ◽  
Relative Abundances

Both observational and theoretical studies of molecular cloud chemistry are hindered by many difficulties which are partially circumvented by studying the relative abundances of isomers synthesized from a common set of chemical precursors. Theoretical studies aimed at understanding interstellar abundance ratios for the isomers HCN/HNC, HCO+/HOC+, CH3CN/CH3NC, and C3H2 have been performed.

New Bistable Solutions in Molecular Cloud Chemistry: Nitrogen and Carbon Autocatalysis

2021 ◽  
Vol 909 (2) ◽  
pp. 171
Author(s):  
Gwenaëlle Dufour ◽  
Steven B. Charnley
Keyword(s):  
Molecular Cloud ◽  
Cloud Chemistry

scholarly journals MOLECULAR CLOUD CHEMISTRY AND THE IMPORTANCE OF DIELECTRONIC RECOMBINATION

2009 ◽  
Vol 694 (1) ◽  
pp. 286-293 ◽  
Author(s):  
P. Bryans ◽  
H. Kreckel ◽  
E. Roueff ◽  
V. Wakelam ◽  
D. W. Savin
Keyword(s):  
Molecular Cloud ◽  
Dielectronic Recombination ◽  
Cloud Chemistry

scholarly journals Theoretical Studies of Diffuse Cloud Chemistry

1987 ◽  
Vol 120 ◽  
pp. 217-225
Author(s):  
John H. Black
Keyword(s):  
Steady State ◽  
Gas Phase ◽  
Recent Work ◽  
Theoretical Studies ◽  
Cloud Chemistry ◽  
Gas Phase Chemistry ◽  
Diffuse Cloud ◽  
Phase Chemistry

Some recent work on diffuse cloud chemistry is summarized. Distinctions between gas phase chemistry in steady state and alternative mechanisms are discussed.

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.

scholarly journals Insights on molecular cloud structure

2010 ◽  
Vol 6 (S270) ◽  
pp. 99-102
Author(s):  
João Alves ◽  
Marco Lombardi ◽  
Charles Lada
Keyword(s):  
Molecular Cloud ◽  
Molecular Hydrogen ◽  
Molecular Clouds ◽  
Dust Emission ◽  
Tracer Technique ◽  
Cloud Chemistry ◽  
Molecular Line ◽  
Dust Extinction ◽  
Dust Grain ◽  
Grain Properties

AbstractStars form in the densest regions of clouds of cold molecular hydrogen. Measuring structure in these clouds is far from trivial as 99% of the mass of a molecular cloud is inaccessible to direct observation. Over the last decade we have been developing an alternative, more robust density tracer technique based on dust extinction measurements towards background starlight. The new technique does not suffer from the complications plaguing the more conventional molecular line and dust emission techniques, and when used with these can provide unique views on cloud chemistry and dust grain properties in molecular clouds. In this brief communication we summarize the main results achieved so far using this technique.

scholarly journals AHERSCHEL/HIFI LEGACY SURVEY OF HF AND H2O IN THE GALAXY: PROBING DIFFUSE MOLECULAR CLOUD CHEMISTRY

2015 ◽  
Vol 806 (1) ◽  
pp. 49 ◽  
Author(s):  
P. Sonnentrucker ◽  
M. Wolfire ◽  
D. A. Neufeld ◽  
N. Flagey ◽  
M. Gerin ◽  
...  
Keyword(s):  
Molecular Cloud ◽  
Cloud Chemistry ◽  
The Galaxy
Sign in / Sign up

Export Citation Format

Share Document