Results 21 to 30 of about 506,032 (344)

Chemical Analysis of a Diffuse Cloud along a Line of Sight Toward W51: Molecular Fraction and Cosmic-Ray Ionization Rate [PDF]

, 2012
Absorption lines from the molecules OH+, H2O+, and H3+ have been observed in a diffuse molecular cloud along a line of sight near W51 IRS2. We present the first chemical analysis that combines the information provided by all three of these species ...
Bieging, Carpenter, D. A. Neufeld, Geballe, Gerin, Goto, Goto, Goto, Hollenbach, Indriolo, Indriolo, Indriolo, J. H. Black, J. R. Goicoechea, Jensen, K. M. Menten, Kang, Koo, Le Petit, M. Gerin, McCall, Neufeld, Nick Indriolo, Oka, Okumura, Rachford, Rachford, Sheffer, T. R. Geballe   +28 more
core   +4 more sources

Analysis of Fentanyl and Fentanyl Analogs Using Atmospheric Pressure Chemical Ionization Gas Chromatography-Mass Spectrometry (APCI-GC-MS). [PDF]

J Am Soc Mass Spectrom
Reyes Monroy KA, McCrary R, Parry I, Webber C, Golden TD, Verbeck GF.   +5 more
europepmc   +2 more sources

Real-Time Measurement of Herbicides in the Atmosphere: A Case Study of MCPA and 2,4-D during Field Application

Toxics, 2019
Atmospheric sources of herbicides enable short- and long-range transport of these compounds to off-target areas but the concentrations and mechanisms are poorly understood due, in part, to the challenge of detecting these compounds in the atmosphere.
Trey Murschell, Delphine K. Farmer
doaj   +1 more source

Molecular double core-hole electron spectroscopy for chemical analysis [PDF]

, 2010
We explore the potential of double core hole electron spectroscopy for chemical analysis in terms of x-ray two-photon photoelectron spectroscopy (XTPPS).
Christian Buth, Hess B. A., Hironobu Fukuzawa, Kiyoshi Ueda, Lorenz S. Cederbaum, Masahiro Ehara, Motomichi Tashiro, Nikolai V. Kryzhevoi, Siegbahn K.   +8 more
core   +1 more source

New composition-dependent cooling and heating curves for galaxy evolution simulations [PDF]

, 2013
In this paper, we present a new calculation of composition-dependent radiative cooling and heating curves of low-density gas, intended primarily for use in numerical simulations of galaxy formation and evolution.
Cloet-Osselaer, Annelies, De Rijcke, Sven, Decroos, J, Jachowicz, Natalie, Koleva, Mina, Schroyen, Joeri, Vandenbroucke, Bert   +6 more
core   +2 more sources

Laboratory Photo-chemistry of PAHs: Ionization versus Fragmentation [PDF]

, 2015
Interstellar polycyclic aromatic hydrocarbons (PAHs) are expected to be strongly processed by vacuum ultraviolet photons. Here, we report experimental studies on the ionization and fragmentation of coronene (C24H12), ovalene (C32H14) and hexa-peri ...
Castellanos, Pablo, Joblin, Christine, Ligterink, Niels, Linnartz, Harold, NAhon, Laurent, Paardekooper, Daniel M., Tielens, Alexander G. G. M., Zhen, Junfeng   +7 more
core   +3 more sources

NH4+ Association and Proton Transfer Reactions With a Series of Organic Molecules

Frontiers in Chemistry, 2019
In this study, we present reactions of NH4+ with a series of analytes (A): acetone (C3H6O), methyl vinyl ketone (C4H6O), methyl ethyl ketone (C4H8O), and eight monoterpene isomers (C10H16) using a Selective Reagent Ionization Time-of-Flight Mass ...
Eva Canaval, Noora Hyttinen, Benjamin Schmidbauer, Lukas Fischer, Armin Hansel   +4 more
doaj   +1 more source

Eliminating Error in the Chemical Abundance Scale for Extragalactic HII Regions [PDF]

, 2012
In an attempt to remove the systematic errors which have plagued the calibration of the HII region abundance sequence, we have theoretically modeled the extragalactic HII region sequence.
Abazajian, Aller, Alloin, Baldwin, Bresolin, Bresolin, Brinchmann, Christensen, D. C. Nicholls, Davé, Denicoló, Dopita, Dopita, Dopita, Dopita, Dors, Dors, Díaz, Díaz, Esteban, Esteban, Esteban, Esteban, Esteban, Esteban, Ferland, Ferland, García-Rojas, García-Rojas, García-Rojas, García-Rojas, Garnett, Grevesse, H. J. Zahid, Hägele, Hägele, Izotov, Izotov, J. Scharwächter, Jensen, Kewley, Kewley, Kewley, Kingdon, Kobulnicky, Kobulnicky, L. J. Kewley, Lara-López, Lara-López, Leitherer, Levesque, López-Sánchez, López-Sánchez, López-Sánchez, López-Sánchez, M. A. Dopita, McGaugh, Mesa-Delgado, Mesa-Delgado, Mesa-Delgado, Mesa-Delgado, Mollá, Monreal-Ibero, Moustakas, Osterbrock, Pagel, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Peimbert, Pettini, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Pilyugin, Przybilla, Pustilnik, Pérez-Montero, Pérez-Montero, Pérez-Montero, Pérez-Montero, Rodríguez, Rosales-Ortega, Shaw, Simón-Díaz, Stasińska, Stasińska, Stasińska, Sutherland, Tremonti, Tsamis, Veilleux, Vázquez, Vílchez, Yin, York, Á. R. López-Sánchez   +102 more
core   +3 more sources

Solving the excitation and chemical abundances in shocks: the case of HH1 [PDF]

, 2015
We present deep spectroscopic (3600 - 24700 A) X-shooter observations of the bright Herbig-Haro object HH1, one of the best laboratories to study the chemical and physical modifications caused by protostellar shocks on the natal cloud.
Antoniucci, S., Bacciotti, F., Giannini, T., Nisini, B., Podio, L.   +4 more
core   +2 more sources

Atmospheric Pressure Chemical Ionization Is a Suboptimal Ionization Source for Steroids [PDF]

Clinical Chemistry, 2018
To the Editor: Biochemical measurement of steroid hormones is imperative for the diagnosis of adrenocortical carcinoma (ACC).1 The lack of clinical syndromes in over half of patients with ACC prevents the early diagnosis of this malignant disease if appropriate laboratory evaluations are not performed (1, 2).
Qian, Sun, Jianghong, Gu, Brian R, Stolze, Steven J, Soldin   +3 more
openaire   +2 more sources