scholarly journals Abundances of Interstellar Molecules and Their Formation on Grain Surfaces

1973 ◽  
Vol 52 ◽  
pp. 363-367
Author(s):  
E. E. Salpeter ◽  
W. D. Watson
Keyword(s):  
Carbon Monoxide ◽  
Molecular Species ◽  
Interstellar Dust ◽  
Dust Grains ◽  
Surface Phenomena ◽  
Interstellar Gas ◽  
Interstellar Molecules ◽  
Gas Density ◽  
Molecule Formation ◽  
Interstellar Dust Grains

Surface phenomena on interstellar dust grains, which are relevant for molecule formation, are summarized. For various molecular species in the interstellar gas, the dependence of abundance on gas density and the degree of shielding of starlight is predicted. These predictions seem to fit with recent observations on carbon-monoxide, but there seems to be a discrepancy for formaldehyde.

scholarly journals Some Implications of the Distribution of Interstellar Molecules

1973 ◽  
Vol 52 ◽  
pp. 351-361
Author(s):  
Lewis E. Snyder
Keyword(s):  
Observational Data ◽  
Interstellar Dust ◽  
Star Cluster ◽  
Dust Grains ◽  
Interstellar Molecules ◽  
Evolutionary Path ◽  
Interstellar Clouds ◽  
Molecular Formation ◽  
Interstellar Dust Grains ◽  
Cloud Evolution

It is suggested that molecular observations of interstellar clouds can be used to determine the stage of cloud evolution. However, before observational data can reliably be used to investigate the evolutionary path leading from a tenuous cloud of gas and interstellar dust to a star cluster, mechanisms of molecular formation, excitation, and destruction must be taken into account. The evidence is growing that interstellar dust grains have an important role in molecular formation and destruction.

Temperature fluctuations in interstellar dust grains

1979 ◽  
Vol 65 (1) ◽  
pp. 155-166 ◽  
Author(s):  
Per A. Aannestad ◽  
Scott J. Kenyon
Keyword(s):  
Interstellar Dust ◽  
Temperature Fluctuations ◽  
Dust Grains ◽  
Interstellar Dust Grains

scholarly journals CO2formation on interstellar dust grains: a detailed study of the barrier of the CO + O channel

2013 ◽  
Vol 559 ◽  
pp. A49 ◽  
Author(s):  
M. Minissale ◽  
E. Congiu ◽  
G. Manicò ◽  
V. Pirronello ◽  
F. Dulieu
Keyword(s):  
Interstellar Dust ◽  
Dust Grains ◽  
Interstellar Dust Grains

scholarly journals The formation of the building blocks of peptides on interstellar dust grains

2019 ◽  
Vol 15 (S350) ◽  
pp. 216-219
Author(s):  
N. F. W. Ligterink ◽  
J. Terwisscha van Scheltinga ◽  
V. Kofman ◽  
V. Taquet ◽  
S. Cazaux ◽  
...  
Keyword(s):  
Interstellar Dust ◽  
Reaction Network ◽  
Building Blocks ◽  
Dust Grains ◽  
Reaction Products ◽  
Experimental Conditions ◽  
Interstellar Dust Grains ◽  
Temperature Programmed ◽  
Life On Earth ◽  
Emergence Of Life

AbstractThe emergence of life on Earth may have its origin in organic molecules formed in the interstellar medium. Molecules with amide and isocyanate groups resemble structures found in peptides and nucleobases and are necessary for their formation. Their formation is expected to take place in the solid state, on icy dust grains, and is studied here by far-UV irradiating a CH4:HNCO mixture at 20 K in the laboratory. Reaction products are detected by means of infrared spectroscopy and temperature programmed desorption - mass spectrometry. Various simple amides and isocyanates are formed, showing the importance of ice chemistry for their interstellar formation. Constrained by experimental conditions, a reaction network is derived, showing possible formation pathways of these species under interstellar conditions.

scholarly journals LIFECYCLE OF THE INTERSTELLAR DUST GRAINS IN OUR GALAXY VIEWED WITH AKARI/MIR ALL-SKY SURVEY

2012 ◽  
Vol 27 (4) ◽  
pp. 117-122
Author(s):  
D. Ishihara ◽  
H. Kaneda ◽  
A. Mouri ◽  
T. Kondo ◽  
S. Suzuki ◽  
...  
Keyword(s):  
Interstellar Dust ◽  
Dust Grains ◽  
Interstellar Dust Grains ◽  
Sky Survey

scholarly journals Interstellar Carbon Dust

2019 ◽  
Vol 5 (4) ◽  
pp. 80
Author(s):  
Emmanuel Dartois
Keyword(s):  
Interstellar Dust ◽  
Essential Role ◽  
Carbon Budget ◽  
Remote Access ◽  
Dust Grains ◽  
Multiple Bonds ◽  
Spectroscopic Observations ◽  
Interstellar Grains ◽  
Interstellar Dust Grains ◽  
Cosmic Abundance

In the ranking of cosmic abundance of the elements, carbon is the second element, after oxygen, able to form multiple bonds propagating the formation of a network, thus playing an essential role in the formation of nanometer- to micrometer-sized interstellar dust grains. Astrophysical spectroscopic observations give us remote access to the composition of carbonaceous and organic interstellar grains. Their presence and abundances from spectroscopic observations and the phases of importance for the Galactic carbon budget are considered in this article.

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