Publications (2)0 Total impact
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Article: Mass-selective ion accumulation and fragmentation in a linear octopole ion trap external to a fourier transform ion cyclotron resonance mass spectrometer
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ABSTRACT: Electrosprayed protein ions are accumulated and mass selected in an external linear octopole trap before injection into a Fourier transform ion cyclotron resonance (FTICR) mass spectrometer. Mass selection is performed by application of superimposed rf and dc octopole electric potentials during ion accumulation. Ion trajectory stability and mass selection in the octopole field are explained qualitatively by analogy to a quadrupole mass filter. Accumulation of ions from a selected m/z range is demonstrated experimentally for 7 and 9.4 T electrospray ionization (ESI) FTICR mass spectrometers. Ion fragmentation in the octopole may occur under certain operating conditions.International Journal of Mass Spectrometry. -
Article: Direct optical spectroscopy of gas-phase molecular ions trapped and mass-selected by ion cyclotron resonance: laser-induced fluorescence excitation spectrum of hexafluorobenzene (C6F6+)
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ABSTRACT: The laser-induced fluorescence (LIF) excitation spectrum of gas-phase hexafluorobenzene cations (C6F6+) has been measured at room temperature, by ion trapping and cyclotron frequency-based mass-selection. The optical spectral resolution, vibrational state assignments, and their corresponding wavelengths compare favorably to prior data [J. Chem. Phys. 70 (1979) 138]. The present approach offers a general entry into optical spectroscopy of collisionally stable gas-phase ions.Chemical Physics Letters.
