Ion and Ionization
Multi-scheme chemical ionization inlet (MION) for fast switching of reagent ion chemistry in atmospheric pressure chemical ionization mass spectrometry (CIMS) applications
... chemical IONization in- let, MION, (Karsa ...coupled ion sources (simplified two-source setup shown in Fig. 1). The ion source connect- ing MION to the mass spectrometer entrance weighs about ...
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Development and Characterization of an Atmospheric Pressure Ionization Source Matrix-Assisted Laser Desorption Electrospray Ionization Coupled to Fourier Transform Ion Cyclotron Resonance Mass Spectrometry for Analysis of Biological Macromolecules
... Soft ionization sources such as matrix-assisted laser desorption ionization (MALDI) 1, 2 and electrospray ionization (ESI) 3 have increased both the quantity and quality of information obtainable ...
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Methods to detect volatile organic compounds using selected-ion chemical ionization mass spectrometry
... to ion signal in the mass spectrum that is not due to the reagent or VOC ...the ionization of contaminants present in the mass analyzer and contaminants introduced from the Tedlar TM sampling ...
190
Characterisation of macromolecules using electrospray ionization and Fourier transform ion cyclotron resonance mass spectrometry
... Presumably the additional predissociation channels seen in the V I r,+ v = 16 & 17 chlorine images originate from similar superexcited states, the next superexcited states in the Rydberg[r] ...
252
An ion-neutral model to investigate chemical ionization mass spectrometry analysis of atmospheric molecules – application to a mixed reagent ion system for hydroperoxides and organic acids
... PCIMS instrument was specifically designed to be mounted and utilized from an aircraft and was flown on the NCAR HIAPER (UCAR/NCAR-EOL, 2005) aircraft in the Deep Convective Clouds and Chemistry experiment (DC3; Barth et ...
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Chemical ionization quadrupole mass spectrometer with an electrical discharge ion source for atmospheric trace gas measurement
... al., 2009). The use of the RF discharge for PAN detection results in an increase in background signal (from a few hertz when using 210 Po to several hundred hertz when using the RF discharge ion source) even in ...
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Performance of a corona ion source for measurement of sulfuric acid by chemical ionization mass spectrometry
... ∼3.1 mm. The needle is held by a little ring made of stainless steel which centers it inside a cylindrical bore of the PEEK part. This part has a tiny through-hole which allows the tip of the needle to penetrate but not ...
7
The aerosol impact spectrometer: a versatile platform for studying the velocity dependence of nanoparticle-surface impact phenomena
... electrospray ionization and transferred into a low vacuum through a 150- μ m Pt electron microscope ...on ion ensembles [31, 32] and in a single-particle application by Benner ...
17
Detection of Oxidized Ferrocenes by LC MS with Electrospray Ionization Using Picric Acid as the Counter Ion
... Ferrocene (Figure 1) is highly stable in air, so oxidation of the central iron atom from Fe (II) to Fe (III) under ambient conditions does not occur readily, but ferrocene oxidizes in air under acidic conditions to form ...
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Ultraviolet photochemistry of 2 bromothiophene explored using universal ionization detection and multi mass velocity map imaging with a PImMS2 sensor
... More recent solutions are pixel based and can operate at higher signal levels. This is because each pixel records the time an ion is detected and its spatial information comes from the identity of the reporting ...
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Bisulfate – cluster based atmospheric pressure chemical ionization mass spectrometer for high-sensitivity (< 100 ppqV) detection of atmospheric dimethyl amine: proof-of-concept and first ambient data from boreal forest
... For direct amine measurements bisulfate–sulfuric acid clusters need to be generated first. Therefore, preceding the nitrate CI system, a flow (1–2 L min −1 ) saturated in sulfu- ric acid vapour is mixed with the sample ...
11
Photoelectrocatalytic Oxidation of Ethinylestradiol on a Ti/TiO2 Electrode: Degradation Efficiency and Search for By Products
... an ion trap mass spec- trometer (POLARIS Q) from ThermoElectron Corporation (San Jose, CA, ...electron ionization at 70 eV, full scan mode with a mass range of 50 - 200, and a source temperature of 200 ...
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COMPLEX OF NUMERICAL MODELS FOR COMPUTATION OF AIR ION CONCENTRATION IN PREMISES
... The complex of numerical models for computa- tion the air ions concentration in the premises was developed. 2D CFD model, which is based on the use of aerodynamics, electrostatics and mass trans- port equations, allows ...
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A Study of the O4+ Emissivity Profiles with Two Separate Photon Emissivity Coefficient Databases and a Comparison of the Impurity Diffusion Coefficients in the Aditya Tokamak
... A change in ionization/recombination data from ADAS (ION./REC.) to NIFS (ION./REC.) does not have an impact of the same magnitude on the O 4+ emissivity and therefore on the impurity transport ...
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The adipsin acylation stimulating protein system and regulation of intracellular triglyceride synthesis
... analysis, ion spray ionization mass spectroscopy, and amino acid composition analysis all indicate that the active purified protein is a fragment of the third component of plasma complement, ...
6
Mechanism of Protein Charging and Supercharging in Electrospray Ionization: Molecular Dynamics Simulations and Experimental Investigations
... A potential problem with measurements on salt-contaminated samples is a drift in sensitivity, caused by the deposition of non-volatile material on the ion optics during a series of measurements. An internal ...
198
A compact PTR-ToF-MS instrument for airborne measurements of volatile organic compounds at high spatiotemporal resolution
... chemical ionization source (glow discharge–ion drift tube), (ii) ion transfer optics that deliver ions from the drift tube to the MS, (iii) a newly developed compact oa- TOF-MS for ion mass ...
10
Automated control of plasma ion-assisted electron beam-deposited TiO2 optical thin films
... oxygen ionization energy ...Ar ion current density increases oxygen ionization, resulting in increased oxygen plasma reactivity and enhanced oxidation (reduced optical absorption) of the deposited ...
11
Petroleomic depth profiling of Staten Island salt marsh soil : 2ω detection FTICR MS offers a new solution for the analysis of environmental contaminants
... Atmospheric pressure chemical ionization Fourier transform ion cyclotron resonance mass.. spectrometry for complex thiophenic mixture analysis.[r] ...
40
THE SEPARATE EFFECTS OF HYPERPARATHYROIDISM, HYPERCALCEMIA OF MALIGNANCY, RENAL FAILURE, AND ACIDOSIS ON THE STATE OF CALCIUM, PHOSPHATE, AND OTHER IONS IN PLASMA
... acidosis, 3 hyperparathyroidism, and 4 hypercalcemia of other types, upon several parameters: 1 the percentage ionization of plasma calcium; 2 the ion product [Ca2+] X [HPO42-]; 3 the ab[r] ...
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