Showing papers in "International Journal of Mass Spectrometry in 2001"

TL;DR: In this paper, the design of a new ion mobility mass spectrometer is presented, which features an electrospray ion source; an ion funnel to transmit ions efficiently from the source to the mobility cell and to accumulate ions in the pulsed ion mode; a mobility cell, and a quadrupole mass analyzer.

TL;DR: In this article, the authors used multiple collector inductively coupled plasma mass spectrometry for the precise measurement of variations in the isotopic composition of Mg in a range of materials.

TL;DR: A review of the history of dynamic mass spectrometers can be found in this paper, where the authors consider the development of the time-of-flight (TOF) mass-spectrometers and stress their two major advantages over the static (magnetic) instruments, namely the unlimited mass range and the possibility of obtaining extremely rapidly mass spectra over a broad ion mass range.

TL;DR: PTR-MS is a chemical ionization mass spectrometry technique that uses proton transfer reactions with H 3 O + ions for on-line measurements of organic trace gases in air as discussed by the authors.

TL;DR: In this article, a multidimensional approach is proposed for the analysis of complex biomolecular mixtures such as those that arise upon tryptic digestion of protein mixtures, where components in a mixture are separated using reversed phase HPLC.

TL;DR: In this article, a study of 14 flavonoids, monohydroxy-to pentahydroxy-substituted, has been carried out using electrospray ionization coupled with high performance liquid chromatography and tandem mass spectrometry.

TL;DR: In this article, the binding of 18-crown-6-ether (18C6) to biologically relevant groups is studied by way of electrospray ionization (ESI) quadrupole ion-trap mass spectrometry.

TL;DR: In this paper, the coupling of electrospray ionization to ion-molecule techniques in the gas phase can yield detailed information about elementary reaction steps of transition-metal compounds with fully intact coordination spheres.

TL;DR: In this article, an asymmetric version of the toroidal rf ion trap analyzer was constructed and this device has demonstrated unit mass resolution performance, however, due to the significant contribution of additional nonlinear fields introduced by the rotation of the symmetrical ion trap cross-section.

TL;DR: In this paper, the tandem mass spectrometry fragmentation reactions of 21 protonated N-acyl amino acid methyl esters are examined as models for more complicated peptides.

TL;DR: Kurunczi et al. as mentioned in this paper reported the observation of intense continuous vacuum ultraviolet radiation in the range 60-100 nm from microhollow cathode discharge plasmas in high-pressure He (up to 600 Torr).

TL;DR: In this paper, the authors showed that the idea of a uniform matrix-assisted laser desorption/ionization (MALDI) mechanism that accounts for the spreading applications has to be given up.

TL;DR: In this paper, the authors evaluated the mechanisms of energy deposition in matrix-assisted laser desorption/ionization mass spectrometry with infrared lasers (IR-MALDI-MS) using a series of experiments and concluded that the most probable mechanisms for the observed deviation of the threshold fluence behavior from the wavelength course of the IR-absorption spectra are, absorption by either free or weakened O-H and N-H stretching modes or by residual free water.

TL;DR: A comprehensive and critical assessment of published data on the total, dissociative and nondissociative electron attachment cross sections for SF 6 allowed as discussed by the authors to recommend or suggest room temperature values for these cross sections over an energy range from 0.0001 eV to 15 eV.

TL;DR: Several new diatomic molecule-containing endohedral fullerenes were prepared by heating C60 or C70 under high pressures of the corresponding gases, and their existence was demonstrated through high sensitivity, wide dynamic range mass spectrometry as discussed by the authors.

TL;DR: In this article, the authors used the laser photoelectron attachment (LPA) method to investigate dissociative electron attachment to carbon tetrachloride in the electron energy range 0 E ≤ 173 meV with very high resolution (energy width 1 meV).

TL;DR: In this paper, the linearity of the count-rate response of discrete dynode secondary electron multipliers (SEMs) is investigated for ion-counting. But the results consistently reveal small degrees of nonlinearity and demonstrate the need to test and characterize the response of SEMs to achieve accurate measurements.

TL;DR: In this paper, a branching ratio (R) is related, using the kinetic method, to an enthalpic term ΔNiIIBDE, the difference between the formation enthalpies of the two dimeric clusters.

TL;DR: In this paper, the gas phase fragmentation reactions of [M+H]+ ions of the methyl esters of histidine and histidine containing di-and tripeptides were examined by electrospray ionization (ESI) multistage mass spectrometry (MSn) experiments using a quadrupole ion trap mass analyzer.

TL;DR: In this article, the results of a study designed to investigate if consistent quantification of chemically different compounds can be realized using these three precursor ion species in the presence of humid air and breath.

TL;DR: In this paper, the Deutsch-mark formalism has been used to calculate absolute electron impact ionization cross sections for the technologically relevant molecules NO2, BF3, BCl3, HX (X = F, Cl, Br, J), Br2, J2, WF6, GeHx (x = 1-4), TMS (tetramethylsilane), HMDSO (hexamethyldisiloxane), and TEOS(tetraethoxysilane).

TL;DR: In this article, a series of neutral as well as singly positively and negatively charged clusters were detected for gold and lead targets, ranging in size from >100 atoms to >1000 atoms.

TL;DR: In this article, the transfer of zinc ions between Zn 7 -metallothionein and apo peptides was investigated. But the authors only used a quadrupole ion trap and showed that interprotein contact is required for these transfers.

TL;DR: In this article, it was shown that the zinc complex of deprotonated glycine does not pre-exist in solution, and that it is also formed in the electrospray process, during one of the last desolvation steps.

TL;DR: In this paper, the effect of nonlinear field imperfections on the performance of quadrupole mass spectrometers has been investigated, and the results are applied to the mass-selective axial instability scan of an ion trap.

TL;DR: In this article, the authors determined the absolute L 1 Na + L 2 and relative Na + -L bond dissociation energies experimentally by competitive collision-induced dissociation of Na+L 2 complexes with xenon in a guided ion beam mass spectrometer.

TL;DR: In this paper, a splitting of the Mathieu stability diagram into multiple islands, yielding multiple operating points available for ion filtering was investigated theoretically and experimentally, and the modified stability diagram was calculated exactly using the solutions to Hill's equation, and yields excellent agreement with experiment.

TL;DR: In this paper, a linear quadrupole ion trap coupled to a 3.5-tesla Fourier transform ion cyclotron (FTICR) mass spectrometer was evaluated.

TL;DR: In this article, the precursors and the fragments of [Gly-H + Zn]+ ions are studied by means of collisional induced decomposition (CID) experiments including H/D exchanges and accurate ab initio calculations.

TL;DR: In this article, a variety of collisional activation conditions were explored for each charge state to determine optimal conditions for yielding the highest quality product ion spectra, with on-resonance activation conditions providing the best quality spectra.