Results 1 to 10 of about 947 (132)
Interstellar abundances : gas and dust.
Astrophysical Journal, 1974 Data on abundances of interstellar atoms, ions and molecules in front of zeta Oph are assembled and analyzed. The gas-phase abundances of at least 11 heavy elements are significantly lower, relative to hydrogen, than in the solar system. The abundance deficiencies of certain elements correlate with the temperatures derived theoretically for particle ...
G B Field
exaly +2 more sources
High‐Pressure Carbonaceous Phases as Minerals
Geophysical Monograph Series, Page 11-23., 2020 This book is Open Access. A digital copy can be downloaded for free from Wiley Online Library.
Explores the behavior of carbon in minerals, melts, and fluids under extreme conditions
Carbon trapped in diamonds and carbonate-bearing rocks in subduction zones are examples of the continuing exchange of substantial carbon ...
Oliver Tschauner
wiley +1 more source
The abundance of interstellar OD
The Astrophysical Journal, 1985 We present the chemistry of OD and estimate the abundance of OD in diffuse and dense molecular clouds. We predict substantial enhancements in the abundance of OD relative to OH and argue that density ratios of 0.01 or greater are likely in many clouds. A search could add OD to the list of known interstellar molecules.
K. Croswell, A. Dalgarno
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Abundance of interstellar aluminum
The Astrophysical Journal, 1984 New observations of Al II 1670 A, the only line of the dominant ionization stage of interstellar aluminum detected to date, are presented. Observations of ionized silicon are used to define an empirical curve of growth from which aluminum depletions can be derived.
E. S. Barker +3 more
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The Abundance of Interstellar Nitrogen
The Astrophysical Journal, 1997 14 pages, LaTeX, 2 Postscript figures; ApJ Letters, in ...
Meyer, David M. +2 more
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Boron abundances in diffuse interstellar clouds [PDF]
Proceedings of the International Astronomical Union, 2009 AbstractWe present a comprehensive survey of B abundances in diffuse interstellar clouds from HST/STIS observations along 56 Galactic sight lines. Our sample is the result of a complete search of archival STIS data for the B II λ1362 resonance line, with each detection confirmed by the presence of absorption from other dominant ions at the same ...
Ritchey, A. M. +3 more
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THE ABUNDANCE OF BORON IN DIFFUSE INTERSTELLAR CLOUDS [PDF]
The Astrophysical Journal, 2011 We present a comprehensive survey of boron abundances in diffuse interstellar clouds from observations made with the Space Telescope Imaging Spectrograph (STIS) of the Hubble Space Telescope. Our sample of 56 Galactic sight lines is the result of a complete search of archival STIS data for the B II 1362 resonance line, with each detection confirmed by ...
Ritchey, A. M. +3 more
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The Determination of Electron Abundances in Interstellar Clouds [PDF]
Symposium - International Astronomical Union, 1979 A new method for estimating electron fractions in shielded molecular clouds is proposed on the basis of gas phase ion-molecule reactions which involves measuring the quantity . Applied to existing data, it yields upper limits to Xe in the range from 10−8 to 10−7 for a variety of clouds, warm as well as cool.
A. Wootten, R. Snell, A. E. Glassgold
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Interstellar Extinction and Elemental Abundances [PDF]
The Astrophysical Journal Supplement Series, 2021 Abstract Elements in the interstellar medium (ISM) exist in the form of gas or dust. The interstellar extinction and elemental abundances provide crucial constraints on the composition, size, and quantity of interstellar dust. Most of the extinction modeling efforts have assumed the total (gas and dust) abundances of the dust-forming ...
Zuo, W. B., Li, Aigen, Zhao, Gang
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Angewandte Chemie, Volume 138, Issue 25, 15 June 2026.By employing dimensionally reduced reaction descriptors, a human–machine collaboration framework for efficient electrochemical nitrate reduction to NH3 electrocatalysts screening is established and drastically shorten the discovery timeframe. A new kinetic model is established in combination with a rotating ring‐disk electrode, unveiling the pivotal ...
Yingying Cheng +3 more
wiley +2 more sources