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Trapping of ions in the electron beam of a FTICR mass spectrometer is investigated and a simple model describing the confinement process is presented. Detection of resistive-wall destabilization of the magnetron motion of ions in the trapped-ion cell is used to determine conditions for ion trapping within and escape from the electron beam. The model predicts a potential well that is dependent on...
An electron beam ion trap is used to produce and confine highly-charged atomic ions in an energetic electron beam (electron trapping mode). After switching off the electron beam the ions remain trapped due to the external magnetic and electric fields. We have investigated the properties of this magnetic trapping mode by use of Fourier transform ion cyclotron resonance mass spectrometry. We found...
The proton affinity at the heteroatom PA X of four α-radicals ( CH 2 OH, CH 3 CHOH, CH 2 OCH 3 and CH 2 NH 2 ) was measured by studying the deprotonation of the corresponding α-distonic ions in the cell of a FTICR spectrometer. This method can only be used for α-distonic ions which are more stable than their molecular...
The activation of methane and of several small alkanes and alkenes by thorium cations, as studied by Fourier transform ion cyclotron resonance/mass spectrometry, is described. Thermalized Th + ions dehydrogenate methane with a rather low efficiency (kk L = 0.02) to form ThCH +2 . Th + ions react exothermically with the studied alkanes (ethane, propane, n-butane,...
Three isomeric structures of Fe(C 7 H 7 ) + , presumably, Fe(tropylium) + , Fe(benzyl) + , and Fe(tolyl) + , are studied with Fourier transform ion cyclotron resonance (FTICR) mass spectrometry and by theoretical calculations. Of particular interest is the role of the metal in stabilizing the tolyl ligand, given that the unmetallated tolyl ion, C ...
The decay amplitude envelope of an ICR time-domain signal determines its corresponding Fourier transform mass spectral line shape. The commonly accepted FT-ICR frequency-domain unapodized Lorentzian spectral line shape originates from the Langevin ion-neutral collision model, in which an ion is treated as a point charge that induces an electric dipole moment in a neutral collision partner. The Langevin...
The Bronsted acidities of several neutral NH-acids (substituted diphenylamine, substituted anilines and imides) were measured in the gas phase (pulsed FT ICR spectrometry), dimethyl sulfoxide and aqueous solution. Comparison of the Bronsted acidities of neutral NH-acids in the gas phase, dimethyl sulfoxide and water was also carried out. It was shown that substituent effects on the acidity of the...
The gas-phase reactions of FeCF +2 and CoCF +2 with selected linear and branched alkanes and olefins, and cyclic alkanes are studied by Fourier transform ion cyclotron resonance (FTICR) mass spectrometry. For reactions with alkanes, condensation and initial C-C insertion are dominant, in contrast to the C-H insertion and carbene-alkyl coupling of FeCH +2 and...
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