Results 311 to 320 of about 891,565 (361)
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Paper spray ionization of noncovalent protein complexes.
Analytical Chemistry, 2014Paper spray (PS) ionization, an ambient ionization method, has previously been explored as a direct and fast method for mass spectrometric analysis of complex mixtures.
Yun Zhang +3 more
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Ionization and dissociative ionization of by electron impact
Journal of Physics B: Atomic, Molecular and Optical Physics, 1997Absolute cross sections for CO2+, C2+ and O2+ formation from CO+ by electron impact have been measured in the energy range from below the respective ionization or dissociative ionization thresholds to approximately 2500 eV. The animated crossed-beams method has been employed.
A Siari +3 more
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Development, characterization, and application of paper spray ionization.
Analytical Chemistry, 2010Paper spray is developed as a direct sampling ionization method for mass spectrometric analysis of complex mixtures. Ions of analyte are generated by applying a high voltage to a paper triangle wetted with a small volume (
Jiangjiang Liu +5 more
semanticscholar +1 more source
Ionization Constants and Ionization Profiles
2007Most drug molecules are ionizable in aqueous solutions. Ionization occurs when the molecules acquire or lose hydrogen ions in response to changes in the pH of the solution. This chapter reviews the theory of solution equilibria, which explains the behavior of ionizable molecules in solution, and describes the structural features of organic molecules ...
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Matrix-assisted laser desorption/ionization mass spectrometry of biopolymers.
Analytical Chemistry, 1991Analytical chemists and biochemists have long sought accurate, sensitive methods for determining the molecular masses of biopolymers such as proteins and carbohydrates.
F. Hillenkamp +3 more
semanticscholar +1 more source
Low-temperature plasma probe for ambient desorption ionization.
Analytical Chemistry, 2008A low-temperature plasma (LTP) probe has been developed for ambient desorption ionization. An ac electric field is used to induce a dielectric barrier discharge through use of a specially designed electrode configuration.
J. Harper +5 more
semanticscholar +1 more source
Triboelectric spray ionization
Journal of Mass Spectrometry, 2013Triboelectric spray ionization (TESI) is a variation of electrospray ionization (ESI) using common instrumental components, including gas flow, solvent flow rate and heat, the only difference being the use of a high‐voltage power supply for ESI or a static charge for TESI.
Özdemir A, Lin JL, Gillig KJ, Chen CH.
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Carbohydrate Research, 2010
Glucose, galactose, and mannose in H(2)O and D(2)O were ionized by an atmospheric pressure chemical ionization (APCI) method. Isotope effects on fragmentation patterns of the monosaccharides were examined by deuterium replacement of the -OH groups to distinguish the isomers with a single mass spectrometer. The most abundant ions were the [M+H(2)O](+)()
Sung-Seen Choi, Jong-Chul Kim
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Glucose, galactose, and mannose in H(2)O and D(2)O were ionized by an atmospheric pressure chemical ionization (APCI) method. Isotope effects on fragmentation patterns of the monosaccharides were examined by deuterium replacement of the -OH groups to distinguish the isomers with a single mass spectrometer. The most abundant ions were the [M+H(2)O](+)()
Sung-Seen Choi, Jong-Chul Kim
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The Analyst, 2013
A novel self-powered dual spray ionization source has been developed for applications in mass spectrometry. This new source does not use any power supply and produces both positive and negative ions simultaneously. The idea behind this ionization source comes from the Kelvin water dropper.
Özdemir A, Lin JL, Gillig KJ, Chen CH.
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A novel self-powered dual spray ionization source has been developed for applications in mass spectrometry. This new source does not use any power supply and produces both positive and negative ions simultaneously. The idea behind this ionization source comes from the Kelvin water dropper.
Özdemir A, Lin JL, Gillig KJ, Chen CH.
openaire +3 more sources
Physical Review A, 1986
Ion formation in sodium vapor (\ensuremath{\sim}${10}^{11}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$) containing Rydberg atoms (18\ensuremath{\le}n\ensuremath{\le}35) was investigated. Both atomic ions and diatomic molecular ions resulting from collisions between highly excited sodium, ${\mathrm{Na}}^{\mathrm{*}\mathrm{*}}$, and Na(3s) were observed.
C. E. Burkhardt +5 more
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Ion formation in sodium vapor (\ensuremath{\sim}${10}^{11}$ ${\mathrm{cm}}^{\mathrm{\ensuremath{-}}3}$) containing Rydberg atoms (18\ensuremath{\le}n\ensuremath{\le}35) was investigated. Both atomic ions and diatomic molecular ions resulting from collisions between highly excited sodium, ${\mathrm{Na}}^{\mathrm{*}\mathrm{*}}$, and Na(3s) were observed.
C. E. Burkhardt +5 more
openaire +4 more sources