Results 1 to 10 of about 32,814 (289)
Photodissociation of interstellar ArH+ [PDF]
Astronomy & Astrophysics, 2014 Aims. Following the recent detection of 36ArH+ in the Crab nebula spectrum, we have computed the photodissociation rate of ArH+ in order to constrain the physical processes at work in this environment. Methods. Photodissociation cross sections of ArH+ are computed in an ab initio approach including explicit account of spin-orbit coupling. Results.
È. Roueff +2 more
arxiv +10 more sources
Photodissociation of $$ \mathrm{Cr}{\left(\mathrm{CO}\right)}_4\mathrm{bpy} $$ : A Non-Adiabatic Dynamics Investigation. [PDF]
J Comput ChemCarbonyl complexes of $d^6$ metals with an alpha-diimine ligand exhibit both emission and ligand-selective photodissociation from MLCT states. Studying this photodissociative mechanism is challenging for experimental approaches due to an ultrafast femtosecond timescale and spectral overlap of multiple photoproducts. The photochemistry of a prototypical
Ciborowski B, Vacher M.
europepmc +3 more sources
Non-Equilibrium Photodissociation Regions: Ionization-Dissociation Fronts [PDF]
Astrophys.J. 458 (1996) 222, 1995 We discuss the theory of coupled ionization--dissociation fronts produced when molecular clouds are exposed to $\lambda < 1110$\AA\ radiation from hot stars. A steady, composite structure is developed, which generally includes an ionized outflow away from the cloud, an ionization front, a layer of photodissociated gas, a photodissociation front, and a ...
F. Bertoldi, B. T. Draine
arxiv +2 more sources
Nature Communications, 2019 Carbon monoxide is the main C and O reservoir in interstellar media, where it undergoes photochemistry. The authors show that isotopic substitution affects not only its absorption. spectrum and photodissociation rates but also the branching ratio, key to
Pan Jiang +4 more
doaj +2 more sources
Simulation-guided engineering of split GFPs with efficient β-strand photodissociation [PDF]
Nature Communications, 2023 Green fluorescent proteins (GFPs) are ubiquitous for protein tagging and live-cell imaging. Split-GFPs are widely used to study protein-protein interactions by fusing proteins of interest to split GFP fragments that create a fluorophore upon typically ...
Yasmin Shamsudin +4 more
doaj +2 more sources
Photodissociation and chemistry of N$_2$ in the circumstellar envelope of carbon-rich AGB stars [PDF]
A&A 568, A111 (2014), 2014 The envelopes of AGB stars are irradiated externally by ultraviolet photons; hence, the chemistry is sensitive to the photodissociation of N$_2$ and CO, which are major reservoirs of nitrogen and carbon, respectively. The photodissociation of N$_2$ has recently been quantified by laboratory and theoretical studies.
Xiaohu. Li +4 more
arxiv +3 more sources
The effects of nitric oxide cooling and the photodissociation of molecular oxygen on the thermosphere/ionosphere system over the Argentine Islands [PDF]
Annales Geophysicae, 1997 In the past the global, fully coupled, time-dependent mathematical model of the Earth's thermosphere/ionosphere/plasmasphere (CTIP) has been unable to reproduce accurately observed values of the maximum plasma frequency, foF2, at extreme geophysical ...
G. D. Wells +4 more
doaj +3 more sources
The photodissociation and chemistry of CO isotopologues: applications to interstellar clouds and circumstellar disks [PDF]
, 2009 Aims. Photodissociation by UV light is an important destruction mechanism for CO in many astrophysical environments, ranging from interstellar clouds to protoplanetary disks. The aim of this work is to gain a better understanding of the depth dependence and isotope-selective nature of this process. Methods.
R. Visser +4 more
arxiv +3 more sources
Photodissociation and X-Ray-Dominated Regions [PDF]
Annual Review of Astronomy and Astrophysics, 2022 The radiation from stars and active galactic nuclei (AGNs) creates photodissociation regions (PDRs) and X-ray-dominated regions (XDRs), where the chemistry or heating are dominated by far-ultraviolet (FUV) radiation or X-ray radiation, respectively. PDRs
M. Wolfire, L. Vallini, M. Chevance
semanticscholar +1 more source
Conformational-Dependent Photodissociation of Glycolic Acid in an Argon Matrix
Photochem, 2023 Ultraviolet-induced photodissociation and photo-isomerization of the three most stable conformers (SSC, GAC, and AAT) of glycolic acid are investigated in a low-temperature solid argon matrix using FTIR spectroscopy and employing laser radiation with ...
Jussi Ahokas +6 more
doaj +1 more source