Topic
Thermal ionization mass spectrometry
About: Thermal ionization mass spectrometry is a research topic. Over the lifetime, 2455 publications have been published within this topic receiving 70497 citations.
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3,175 citations
TL;DR: In this article, a new method for the concomitant separation of the light rare-earth elements (LREEs), thorium and uranium is described, and applied to the determination of 143 Nd 144 Nd ratios, and concentrations of Sm, Nd, Th and U in silicate rocks, using isotope dilution and thermal ionization mass spectrometry.
768 citations
TL;DR: Measurements on a fossil coral indicate that 10,200 years ago mean annual SSTs near Vanuatu in the southwestern Pacific Ocean were about 5�C colder than today and that seasonal variations in SST were larger, suggesting that tropical climate zones were compressed toward the equator during deglaciation.
Abstract: Seasonal records of tropical sea-surface temperature (SST) over the past 10(5) years can be recovered from high-precision measurements of coral strontium/calcium ratios with the use of thermal ionization mass spectrometry. The temperature dependence of these ratios was calibrated with corals collected at SST recording stations and by (18)O/(16)O thermometry. The results suggest that mean monthly SST may be determined with an apparent accuracy of better than 0.5 degrees C. Measurements on a fossil coral indicate that 10,200 years ago mean annual SSTs near Vanuatu in the southwestern Pacific Ocean were about 5 degrees C colder than today and that seasonal variations in SST were larger. These data suggest that tropical climate zones were compressed toward the equator during deglaciation.
753 citations
TL;DR: The origin of ions in matrix-assisted laser desorption/ionization (MALDI) mass spectrometry is currently a matter of active research as discussed by the authors, and a number of chemical and physical pathways have been suggested for MALDI ion formation.
Abstract: The origin of ions in matrix-assisted laser desorption/ionization (MALDI) mass spectrometry is currently a matter of active research A number of chemical and physical pathways have been suggested for MALDI ion formation, including gas-phase photoionization, ion–molecule reactions, disproportionation, excited-state proton transfer, energy pooling, thermal ionization, and desorption of preformed ions These pathways and others are critically reviewed, and their varying roles in the wide variety of MALDI experiments are discussed An understanding of ionization pathways should help to maximize ion yields, control analyte charge states and fragmentation, and gain access to new classes of analytes © 1999 John Wiley & Sons, Inc Mass Spec Rev 17: 337–366, 1998
738 citations
TL;DR: In this paper, the equivalence of the force acting on an ion in a quadrupole field and the force derived from the Mathieu equation is demonstrated, which permits the application of the solutions of Mathieu's equation to the confinement of gaseous ions.
Abstract: A concise introduction is presented to the theory and application of quadrupole ion trap mass spectrometry. The presentation of the theoretical treatment is based on a demonstration of the equivalence of the force acting on an ion in a quadrupole field and the force derived from the Mathieu equation; this equivalence permits the application of the solutions of Mathieu’s equation to the confinement of gaseous ions. Resonant excitation, collision-induced dissociation, mass spectrometry, tandem mass spectrometry and chemical ionization are discussed in the context of analytical applications. Sample calculations of the trapping parametersqzand βz, the axial secular frequency, mass range, mass range extension and the magnitude of the potential well depth are given. © 1997 by John Wiley & Sons, Ltd.
701 citations