Results 91 to 100 of about 668,448 (162)
The Astrophysical JournalIn the denser and colder regions of the interstellar medium (ISM), gas-phase sulfur is depleted by 2 or 3 orders of magnitude with respect to its cosmic abundance. Thus, which species are the main carriers of sulfur is an open question.
Jessica Perrero +4 more
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THE EFFECT OF RAPID NEUTRAL-NEUTRAL REACTIONS ON CHEMICAL-MODELS OF DENSE INTERSTELLAR CLOUDS
, 1994 Recent experiments on rapid neutral-neutral reactions involving the radical CN at low temperature and the neutral C atom at room temperature suggest that atom-neutral and radical-neutral reactions may be generally more rapid at low temperature than ...
Lee, H.H. +3 more
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Desorption of large molecules from grains in dense interstellar clouds
The Astrophysical Journal, 1991 Laboratory data on the nondestructive desorption of whole leucine (131 amu) molecules from surfaces induced by fast, heavy-ion bombardment are used to propose that heavy ions in the cosmic-ray flux may induce desorption of large molecules from the surfaces of grains in molecular, interstellar ...
JOHNSON RE +3 more
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Simulating molecular cloud regulated star formation in Galaxies [PDF]
, 2007 This thesis is primarily concerned with understanding the process of galaxy formation via the simulation of the interstellar medium, star formation and supernova feedback.
Booth, Craig Martin
core
The Astrophysical JournalOf the about 300 gas-phase molecular species so far detected in the interstellar medium (ISM), mostly via observations of their rotational lines, around 40% contain nitrogen (N) atoms.
Berta Martínez-Bachs +4 more
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A reanalysis of the HCO(+)/HOC(+) abundance ratio in dense interstellar clouds
The Astrophysical Journal, 1986 New theoretical and experimental results have prompted a reinvestigation of the HCO+/HOC+ abundance ratio in dense interstellar clouds. These results pertain principally but not exclusively to the reaction between HOC+ and H2, which was previously calculated by DeFrees, McLean, and Herbst to possess a large activation energy barrier. New calculations,
M F, Jarrold +4 more
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Lyα Processing of Solid-state Ethanolamine: Potential Precursors to Sugar and Peptide Derivatives
The Astrophysical JournalEthanolamine (EA), a key component of phospholipids, has recently been detected in the interstellar medium within molecular clouds. To understand this observation, laboratory studies of its formation and destruction are essential and should be ...
T. Suhasaria +6 more
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Molecular Evolution in Interstellar Clouds. I: Ion Chemistry in Dense Clouds [PDF]
Progress of Theoretical Physics, 1979 Molecular abundances are calculated time-dependently using a chemical scheme which is constructed to represent the evolutional feature of all molecules containing up to 2 heavy atoms (C, N, 0, S and Si) and consisted of the surface recombination of hydrogen on grains and2884gasphase reactions of 234 species. For the model adopted (nH=10'cm-•, T=30K, CH=
openaire +1 more source
Laboratory infrared spectra and fragmentation chemistry of sulfur allotropes
Nature CommunicationsSulfur is one of six life-essential elements, but its path from interstellar clouds to planets and their atmospheres is not well known. Astronomical observations in dense clouds have so far been able to trace only 1 percent of cosmic sulfur, in the form ...
Piero Ferrari +4 more
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The Astrophysical JournalWith the advent of JWST ice observations, dedicated studies on the formation reactions of detected molecules are becoming increasingly important. One of the most interesting molecules in interstellar ice is CO _2 .
Atsuki Ishibashi +5 more
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