Results 291 to 300 of about 891,565 (361)

Ionization of nitromethane in the flame ionization detector [PDF]

Canadian Journal of Chemistry, 1981
The mass spectra observed on sampling the unburnt gases of a flame ionization detector to which nitromethane has been added are due mostly to proton transfer reactions of NH4+ and H3O+. These are formed in the reaction zone from the primary ion HCO+, and pass through the unburnt gases to the sampling orifice.
T. McAllister, A. J. C. Nicholson, J. D. Scott   +2 more
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Ionization of ribonuclease

Archives of Biochemistry and Biophysics, 1965
Abstract The titration of ribonuclease, acid to its isoionic point, has been conducted in 1.80 M KCl. The slopes of the titration curves in the neighborhood of half neutralization of the carboxyl groups have been studied at several ionic strengths.
Keith Breese, Henry B. Bull
openaire   +2 more sources

Molecular excitation energies to high-lying bound states from time-dependent density-functional response theory: Characterization and correction of the time-dependent local density approximation ionization threshold

, 1998
This paper presents an evaluation of the performance of time-dependent density-functional response theory (TD-DFRT) for the calculation of high-lying bound electronic excitation energies of molecules.
M. E. Casida, C. Jamorski, Kim C. Casida, D. Salahub   +3 more
semanticscholar   +1 more source

Impact ionization in β-Ga2O3

Journal of Applied Physics, 2018
A theoretical investigation of extremely high field transport in an emerging wide-bandgap material β-Ga2O3 is reported from first principles. The signature high-field effect explored here is impact ionization.
Krishnendu Ghosh, U. Singisetti
semanticscholar   +1 more source

Practical implications of some recent studies in electrospray ionization fundamentals.

Mass spectrometry reviews (Print), 2001
In accomplishing successful electrospray ionization analyses, it is imperative to have an understanding of the effects of variables such as analyte structure, instrumental parameters, and solution composition.
Nadja B. Cech, C. Enke
semanticscholar   +1 more source

IONIZATION AND DE-IONIZATION IN THE LOWER IONOSPHERE [PDF]

, 1963
Abstract : A body of information pertaining to ionization and de-ionization in the lower ionosphere was compiled from various sources. Part of the data was derived from studies of geophysical observations, part of it from published and unpub lished laboratory measurements, and part from other ionospheric studies.
R. C. Whitten, I .G. Poppoff
openaire   +1 more source

Tunneling Ionization Time Resolved by Backpropagation.

Physical Review Letters, 2016
We determine the ionization time in tunneling ionization by an elliptically polarized light pulse relative to its maximum. This is achieved by a full quantum propagation of the electron wave function forward in time, followed by a classical ...
H. Ni, U. Saalmann, J. Rost
semanticscholar   +1 more source

An iodide-adduct high-resolution time-of-flight chemical-ionization mass spectrometer: application to atmospheric inorganic and organic compounds.

Environmental Science and Technology, 2014
A high-resolution time-of-flight chemical-ionization mass spectrometer (HR-ToF-CIMS) using Iodide-adducts has been characterized and deployed in several laboratory and field studies to measure a suite of organic and inorganic atmospheric species.
B. H. Lee, F. Lopez‐Hilfiker, C. Mohr, T. Kurtén, D. Worsnop, J. Thornton   +5 more
semanticscholar   +1 more source

Ionization and double ionization of small water clusters

The Journal of Chemical Physics, 2006
The valence ionization and double ionization spectra of the water molecule, of the water dimer, and the cyclic water clusters (H2O)3 and (H2O)4 are calculated by ab initio Green’s function methods and discussed in some detail. Particular attention is paid to the analysis of the development of the spectra with increasing cluster size.
Lorenz S. Cederbaum, Imke B. Müller
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Ionization and dissociative ionization of methane molecules

Technical Physics, 2013
A technique for mass-spectrometric investigation of the yield of positive ions produced by direct and electron-impact dissociative ionization of methane molecules is described, and respective experimental data are presented. Doubly charged C 2 + , CH 3 2+
A. N. Mylymko, M. I. Mykyta, O. B. Shpenik, A. N. Zavilopulo   +3 more
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