Results 251 to 260 of about 530,809 (300)

High-resolution laser mass spectrometry

International Journal of Mass Spectrometry and Ion Processes, 1984
Abstract Multi-photon absorption within the small focus of an intense pulsed laser beam leads to an efficient ionization of the absorbing molecules. The point-like ionization region and the peculiar multi-photon excitation mechanism make for an ideal ion source for a mass spectrometer.
H.J. Neusser, U. Boesl, R. Weinkauf, E.W. Schlag   +3 more
openaire   +1 more source

Electrospray Ionization High-Resolution Ion Mobility Spectrometry−Mass Spectrometry

Analytical Chemistry, 1998
A hybrid atmospheric pressure ion mobility spectrometer is described which exhibits resolving power approaching the diffusion limit for singly and multiply charged ions (over 200 for the most favorable case). Using an electrospray ionization source and a downstream quadrupole mass spectrometer with electron multiplier as detector, this ESI-IMS-MS ...
C, Wu, W F, Siems, G R, Asbury, H H, Hill   +3 more
openaire   +2 more sources

High-Resolution Liquid Chromatography–Mass Spectrometry for Lipidomics

2023
Liquid chromatography coupled to tandem mass spectrometry (LC-MS/MS) is a powerful tool for identification and classification of lipids. Ultra-high performance liquid chromatography (UHPLC) allows for robust separations of complex mixtures, while high-resolution mass spectrometry (HRMS) identifies compounds with efficiency and accuracy (Zullig T and ...
Faith Christine, Harvey, Vanessa, Collao, Sanjoy K, Bhattacharya   +2 more
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Choosing between high-resolution mass spectrometry and mass spectrometry/mass spectrometry environmental applications

Environmental Science & Technology, 1990
Selectivity in environmental analyses requires the use of fractionation techniques and HRMS or MS/MS to eliminate specific and nonspecific interferences. In the analysis of TCDDs and TCDFs, HRMS is the method of choice when specific interferences arising from compounds with molecular or fragment ions can be separated from TCDD and TCDF ions at a ...
M. Judith Charles, Yves Tondeur
openaire   +1 more source

HIGH-RESOLUTION MASS SPECTROMETRY

1971
Mass Spectrometry is unique in the type and amount of information that it can often supply on submicrogram samples. Recent advances include improved understanding of the basic factors affecting ion reaction rates, and application of these in metastable and collision-induced decompositions.
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High resolution mass spectrometry of trimethylamine

Organic Mass Spectrometry, 1970
AbstractHigh resolution shows that the four principal fragment peaks of trimethylamine are singlets. Close studies of the metastable transitions in the spectrum have established the origin of almost all fragment peaks.
Georg Hvistendahl, Kjell Undheim
openaire   +1 more source

Yeast Expression Proteomics by High-Resolution Mass Spectrometry

2010
Comprehensive analysis of yeast as a model system requires to reliably determine its composition. Systematic approaches to globally determine the abundance of RNAs have existed for more than a decade and measurements of mRNAs are widely used as proxies for detecting changes in protein abundance.
Walther, Tobias C, Olsen, Jesper Velgaard, Mann, Matthias   +2 more
openaire   +4 more sources

High-resolution field-ionization mass spectrometry

International Journal of Mass Spectrometry and Ion Physics, 1969
Abstract A dual field-ion/electron impact source has been developed for a high-resolution mass spectrometer with which it is possible to obtain both types of spectra on the same sample with little loss of resolution or mass measuring accuracy. An externally replaceable and adjustable blade emitter gives substantially improved sensitivity (10−7 A torr−
E.M. Chait, T.W. Shannon, W.O. Ferry, G.E. van Lear, F.W. McLafferty   +4 more
openaire   +1 more source

High resolution field desorption mass spectrometry: II—glycosides

Biological Mass Spectrometry, 1974
The high resolution field desorption mass spectra of a number of glycosides are described. In all cases the spectra enabled molecular weights and elemental formulae to be established, and the presence of fragment ions due to cleavage of the sugar groups provides considerable assistance in the identification of sugar and aglycone moieties. The [M + 23Na]
H R, Schulten, D E, Games
openaire   +2 more sources

Tissue Analysis with High-Resolution Imaging Mass Spectrometry

2009
Molecular mass spectrometric images of tissue sections facilitate precise location of biomolecules, drugs, their metabolites and the biomolecular aberrations they target. Technological developments are rapidly expanding the capabilities of imaging mass spectrometers.
Altelaar, A.F.M., Heeren, R.M.A.
openaire   +3 more sources