Results 21 to 30 of about 668,448 (162)
Interstellar processes: Ortho/para conversion, radiative association, and dissociative recombination
EPJ Web of Conferences, 2015 The study of the ortho-to-para ratio of assorted gas-phase interstellar molecules such as H2, H2O, NH3, and H2O+ has gained interest in recent years, based partially on new spectral observations of light hydrides by the Herschel Space Observatory ...
Herbst Eric
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Where Does the Energy Go during the Interstellar NH3 Formation on Water Ice? A Computational Study
The Astrophysical Journal, 2023 In the coldest (10–20 K) regions of the interstellar medium, the icy surfaces of interstellar grains serve as solid-state supports for chemical reactions.
Stefano Ferrero +5 more
doaj +1 more source
The Ionization Rate in Dense Interstellar Clouds [PDF]
Symposium - International Astronomical Union, 1987 Measurements of the abundances of OH, HCO+ and DCO+ are employed to derive the ionization rate in molecular clouds.
S. Lepp, A. Dalgarno
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The Role of Magnetic Field in Molecular Cloud Formation and Evolution
Frontiers in Astronomy and Space Sciences, 2019 We review the role that magnetic field may have on the formation and evolution of molecular clouds. After a brief presentation and main assumptions leading to ideal MHD equations, their most important correction, namely the ion-neutral drift is described.
Patrick Hennebelle +2 more
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Submillimetre molecular line observations and modelling of molecular clouds. [PDF]
, 1985 PhDSubmillimetre molecular line observations of molecular clouds in our galaxy are presented, and the data analysed using various alternative cloud models.
Richardson, Kevin John
core +2 more sources
The molecular composition of dense interstellar clouds
The Astrophysical Journal, 1977 Presented in this paper is an ab initio chemical model for dense interstellar clouds that incorporates 598 grain surface reactions, with small grains providing the reaction area. Gas-phase molecules are depleted through collisions with grains. The abundances of 372 chemical species are calculated as a function of time and are found to be of sufficient ...
M. Allen, G. W. Robinson
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Does the H+5 hydrogen cluster exist in dense interstellar clouds?
, 2012 The clustering of hydrogen molecules around a cation in dense interstellar clouds is examined taking into account recent accurate information about the structure and thermochemistry of these clusters.
Nascimento, M., Barbatti, M.
core +1 more source
Kinematics of H I Envelopes Associated with Molecular Clouds
The Astronomical JournalWe investigate the evolution of molecular clouds through the kinematics of their atomic hydrogen (H I ) envelopes, using ^12 CO and 21 cm emission to trace the molecular and atomic gas, respectively.
Thummim Mekuria, Nia Imara
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A High-mass, Young Star-forming Core Escaping from Its Parental Filament
The Astrophysical Journal, 2023 We studied the unique kinematic properties in massive filament G352.63-1.07 at 10 ^3 au spatial scale with the dense molecular tracers observed with the Atacama Large Millimeter/submillimeter Array.
Zhiyuan Ren +19 more
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Photochemistry and Photobiology, EarlyView.Thin solid films of pure glycine or alanine (thicknesses ranging from 10 to 700 nm) were prepared on MgF2 windows using a vacuum sublimation/recondensation method. VUV‐UV spectroscopy of these films enabled us to characterize new absorption cross sections for glycine and alanine for VUV‐UV radiations between 120 and 300 nm.
Juliette Pastore +6 more
wiley +1 more source