Optimum performance of both fragmentation techniques is maintained. The well depth along the z-axis centerline of the open cell is about 37% of the applied potential for cubic geometry but increases to 81% for an elongated cell with aspect ratio two. For a strong magnetic bottle field, the cyclotron motion is frequency modulated at twice the z-oscillation frequency resulting in sidebands. Because of the high signal level, it was possible to omit any electrostatic mirror configuration for bunching the ions. Similarly, non-ICR FT MS development (notably the orbitrap) has benefited from FT-ICR precedents. This can be explained from the simulation results. By simple analogy to weighing objects with a mechanical balance, that “multiplex” advantage can be shown to be equivalent to “multichannel” detection by an array of individual single-channel detectors. The phase between the ion excitation and the image current measurement typically needs to be well controlled for obtaining high quality spectra.
Experimentally, a −57 Hz V−1 shift in cyclotron frequency owing to the radial trapping field is obtained for the open cell compared with a −32 Hz V−1 shift for the closed cell. In a NADEL ICR cell with quadrupolar ion detection, a single slab or an elliptical cylinder is sufficient to minimize the intensity of the reduced cyclotron frequency components, particularly the second harmonic. as a function of R The QIT is an inexpensive, simple, and, Image current measurement followed by Fourier transform has been widely used for Fourier transform ion cyclotron resonance and Orbitrap mass spectrometers. Fourier transform ion cyclotron resonance mass spectrometry is evaluated in trapped ion cells which substitute open rectangular trapping electrodes for trapping plates positioned perpendicular to the magnetic field. ᅟ. Space-charge perturbs ion motion and affects mass accuracy in ion trapping mass spectrometers. The ion trajectory within the valid region of the quartic potential reproduces the essential features of the exact numerical results. Precursor odd-electron anions from fullerene C(60), and even-electron ions from 2,7-di-tert-butylfluorene-9-carboxylic acid and 3,3'-bicarbazole were converted into positive product ions ((-)CR(+)) inside the magnet of a Fourier transform ion cyclotron resonance mass spectrometer. Modulation of the cyclotron and trapping frequencies arising from ion motions in a dual cubic-cell instrument produces sidebands in FT/ICR mass spectra that may be up to a few percent of the amplitude of the associated mass peak. Ion compression, accomplished by steadily increasing the trap voltage, is introduced as a means of expediting z-axis relaxation so that temporal variations of signal due to relaxation phenomena can be minimized. In this paper, we present analytical solutions for the motion of magnetically confined ions of arbitrary initial position, velocity and phase during and after excitation by a spatially uniform oscillatory electric field. A theory is developed to account for the effects of the z-axis oscillation amplitude of trapped ions on the ion signal. Correspondingly, the trapping rings were not segmented, contrary to the trapping electrodes ensemble in the experimental cells.
This new technique is developed theoretically, applied to synthetic data, and then used to perform high resolution mass spectrometry on real data from an ion trap.
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