128 citations · 840 across the 35 of their papers we have counts for
18 papers · 1 filter
Inelastic H + H Collision rates and their impact in the determination of the excitation temperature of H
Daniel Felix-Gonzalez, Pablo del Mazo-Sevillano, Alfredo Aguado +5
Context. In dffuse interstellar clouds the excitation temperature derived from the lowest levels of H is systematically lower than that derived from H2. The differences may b…
Gas phase Elemental abundances in Molecular cloudS (GEMS) VIII. Unlocking the CS chemistry: the CH + S CS + H and C + S CS + C reactions
Carlos M. R. Rocha, Octavio Roncero, Niyazi Bulut +15
We revise the rates of reactions CH + S -> CS + H and C_2 + S -> CS + C, important CS formation routes in dark and diffuse warm gas. We performed ab initio calculations to characte…
The magnesium paradigm in IRC+10216: Discovery of MgCH, MgCN, MgCH, and MgCN
J. Cernicharo, C. Cabezas, J. R. Pardo +7
We found four series of harmonically related lines in IRC\,+10216 with the Yebes\,40m and IRAM\,30m telescopes. The first series corresponds to a molecule with a rotational constan…
The chemistry of H2NC in the interstellar medium and the role of the C + NH3 reaction
M. Agundez, O. Roncero, N. Marcelino +3
We carried out an observational search for the recently discovered molecule H2NC, and its more stable isomer H2CN, toward eight cold dense clouds (L1544, L134N, TMC-2, Lupus-1A, L1…
Gas phase Elemental abundances in Molecular cloudS (GEMS) VII. Sulfur elemental abundance
A. Fuente, P. Rivière-Marichalar, L. Beitia-Antero +18
Gas phase Elemental abundances in molecular CloudS (GEMS) is an IRAM 30m large program aimed at determining the elemental abundances of carbon (C), oxygen (O), nitrogen (N), and su…
The role of highly vibrationally excited H2 initiating the N chemistry: Quantum study and 3-sigma detection of NH emission in the Orion Bar PDR
Javier R. Goicoechea, Octavio Roncero
The formation of hydrides by gas-phase reactions between H2 and a heavy element atom is a very selective process. Reactions with ground-state neutral carbon, oxygen, nitrogen, and…
Formation of phosphorus monoxide (PO) in the interstellar medium: insights from quantum-chemical and kinetic calculations
Juan García de la Concepción, Cristina Puzzarini, Vincenzo Barone +2
In recent years, phosphorus monoxide (PO) -- an important molecule for prebiotic chemistry -- has been detected in star-forming regions and in the comet 67P/Churyumov-Gerasimenko.…
Gas phase Elemental abundances in Molecular cloudS (GEMS). IV. Observational results and statistical trends
M. Rodríguez-Baras, A. Fuente, P. Riviére-Marichalar +33
Gas phase Elemental abundances in Molecular CloudS (GEMS) is an IRAM 30m Large Program designed to estimate the S, C, N, and O depletions and gas ionization degree, X(e-), in a set…
Bottlenecks to interstellar sulfur chemistry: Sulfur-bearing hydrides in UV-illuminated gas and grains
J. R. Goicoechea, A. Aguado, S. Cuadrado +8
Hydride molecules lie at the base of interstellar chemistry, but the synthesis of sulfuretted hydrides is poorly understood. Motivated by new observations of the Orion Bar PDR - 1'…
Gas-phase Elemental abundances in Molecular cloudS (GEMS) III. Unlocking the CS chemistry: the CS+O reaction
N. Bulut, O. Roncero, A. Aguado +36
CS is among the most abundant gas-phase S-bearing molecules in cold dark molecular clouds. It is easily observable with several transitions in the millimeter wavelength range, and…
Gas phase Elemental abundances in Molecular cloudS (GEMS). II. On the quest for the sulphur reservoir in molecular clouds: the case
D. Navarro-Almaida, R. Le Gal, A. Fuente +30
Sulphur is one of the most abundant elements in the Universe. Surprisingly, sulphuretted molecules are not as abundant as expected in the interstellar medium, and the identity of t…
Formation of interstellar SH from vibrationally excited H: Quantum study of S + H SH + H reactions and inelastic collisions
Alexandre Zanchet, Francois Lique, Octavio Roncero +2
The rate constants for the formation, destruction, and collisional excitation of SH are calculated from quantum mechanical approaches using two new SH potential energy su…
Gas phase Elemental abundances in Molecular cloudS (GEMS) I. The prototypical dark cloud TMC 1
A. Fuente, D. Navarro, P. Caselli +30
GEMS is an IRAM 30m Large Program whose aim is determining the elemental depletions and the ionization fraction in a set of prototypical star-forming regions. This paper presents t…
Formation and destruction of SiS in space
Alexandre Zanchet, Octavio Roncero, Marcelino Agúndez +1
The presence of SiS in space seems to be restricted to a few selected types of astronomical environments. It is long known to be present in circumstellar envelopes around evolved s…
The ALMA view of UV irradiated cloud edges: unexpected structures and processes
Javier R. Goicoechea, S. Cuadrado, J. Pety +8
Far-UV photons (E<13.6 eV) from hot massive stars regulate, or at least influence, the heating, ionization, and chemistry of most of the neutral interstellar medium. Investigating…
State-to-state chemistry and rotational excitation of CH in photon-dominated regions
A. Faure, P. Halvick, T. Stoecklin +9
We present a detailed theoretical study of the rotational excitation of CH due to reactive and nonreactive collisions involving C, H, CH, H and free electrons.…
Trans-cis molecular photoswitching in interstellar Space
S. Cuadrado, J. R. Goicoechea, O. Roncero +3
As many organic molecules, formic acid (HCOOH) has two conformers (trans and cis). The energy barrier to internal conversion from trans to cis is much higher than the thermal energ…
Ionization fraction and the enhanced sulfur chemistry in Barnard 1
A. Fuente, J. Cernicharo, E. Roueff +7
Barnard B1b has revealed as one of the most interesting globules from the chemical and dynamical point of view. It presents a rich molecular chemistry characterized by large abunda…