Results 11 to 20 of about 1,537 (221)
Small carbon chains in circumstellar envelopes [PDF]
Monthly Notices of the Royal Astronomical Society, 2014 Observations were made for a number of carbon-rich circumstellar envelopes using the Phoenix spectrograph on the Gemini South telescope to determine the abundance of small carbon chain molecules. Vibration-rotation lines of the $ν_{3}$ antisymmetric stretch of C$_{3}$ near 2040 cm$^{-1}$ (4.902 $μ$m) have been used to determine the column density for ...
Hargreaves, R. J. +2 more
core +7 more sources
Fullerenes and fulleranes in circumstellar envelopes
Journal of Physics: Conference Series, 2016 Three decades of search have recently led to convincing discoveries of cosmic fullerenes. The presence of C60 and C+ 60 in both circumstellar and interstellar environments suggests that these molecules and their derivatives can be efficiently formed in circumstellar envelopes and survive in harsh conditions. Detailed analysis of the infrared bands from
Sadjadi, S, Kwok, S, Zhang, Y
openaire +5 more sources
The photodissociation of CO in circumstellar envelopes [PDF]
Astronomy & Astrophysics, 2017 A&A in ...
M. A. T. Groenewegen
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Crescent-shaped Molecular Outflow from the Intermediate-mass Protostar DK Cha Revealed by ALMA
The Astrophysical Journal, 2023 We report on an Atacama Large Millimeter/submillimeter Array study of the Class I or II intermediate-mass protostar DK Cha in the Chamaeleon II region.
Naoto Harada +8 more
doaj +1 more source
Constraining the Earliest Circumstellar Disks and Their Envelopes [PDF]
The Astrophysical Journal, 2008 23 pages, 4 figures, accepted for publication in the Astrophysical ...
Chiang, Hsin-Fang +4 more
openaire +2 more sources
ChemPhysChem, Volume 24, Issue 22, November 16, 2023., 2023 Can the radical C5N bind a free electron to form a dipole‐bound state? The answer is sought using multi‐reference ab initio quantum chemical methods. Abstract We present results of quantum structure calculations aimed at demonstrating the possible existence of dipole‐bound states (DBS) for the anion C5N- ${{\rm{C}}_5 {\rm{N}}^ - }$ , a species already ...
Stanka Jerosimić +4 more
wiley +1 more source
A sensitive line search in circumstellar envelopes [PDF]
The Astrophysical Journal, 1988 AbstractA molecular line search in the range between 85 and 89 GHz has been performed in the circumstellar envelopes of 11 evolved stars. Emissions of 29SiO J=2−1,28SiO J=2−1, HCN J=1−0, H13CN J=1−0, HC5 N J=33−32, HCO+ J=1−0 transitions and other transitions of C2 H, C4 H, and C3 N have been observed in 11 stars.
null Nguyen-Q-Rieu +6 more
openaire +1 more source
International Journal of Chemical Kinetics, Volume 55, Issue 11, Page 731-742, November 2023., 2023 Abstract The kinetics of the tautomerization of thio‐imidic acids RC(SH)NH were determined at low (50–300 K) and high (500–1500 K) temperatures as R was varied to encompass mono‐ and diatomic species H, F, HO, NC, CN through H2N, HC(O), HC(S), HC≡ C, H3C, F3C, HOCH2, H2C=CH, CH3C(O), H2NCH2 and including ethyl, isopropyl and phenyl groups. The presence
Judith Würmel, John M. Simmie
wiley +1 more source
ChemPhysChem, Volume 24, Issue 20, October 17, 2023., 2023 Threshold photoelectron spectroscopy with vacuum ultraviolet synchrotron radiation and quantum chemical calculations shed new light on the ionization energies of xylyl, picolyl and lutidyl radicals. N‐ and CH3‐substituent effects on the ionization energies of benzyl‐type reactive intermediates are found to be position‐dependent and additive.
Keisuke Kanayama +5 more
wiley +1 more source
The Chemistry of the Cyaphide Ion
Angewandte Chemie International Edition, Volume 62, Issue 32, August 7, 2023., 2023 128 years after the erroneously assumed synthesis of sodium cyaphide, Na(CP), and 51 years after the definitive proof of the existence of HCP, the chemistry of the cyaphide anion has finally gained momentum. This review summarizes the chemistry of the cyaphide anion, (C≡P)−, from its beginnings to the state‐of‐the art.
Tim Görlich +5 more
wiley +1 more source