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- W2018314639 abstract "Abstract A capacitance bridge circuit has been developed for detecting ions stored in an ion cyclotron resonance (ICR) analyzer cell. The circuit functions by accelerating ions at their cyclotron frequency and detecting the resulting ion image current which is induced by the coherent motion of the ions. The main feature of the capacitance bridge circuit is that a mass spectrum can be obtained at constant magnetic field. This not only improves the speed and flexibility of the ICR experiments, but also allows superconducting magnets to be used for greatly improved sensitivity and mass resolution. In our laboratory the capacitance bridge is used in place of a marginal oscillator for pulsed ICR studies of gas-phase ion chemistry and for rapid-scan ICR studies of low-volatility compounds. This paper presents a simplified theory of operation for the capacitance bridge detector and a description of the circuitry which we have developed. Performance tests have been conducted to establish a range of useful operating parameters for the detector. Using an electromagnet at 1.2 tesla, the minimum detectable signal (1 : 1 S/N) is ~7000 ions, and linear response is achieved up to the space-charge limit of ~350 000 ions." @default.
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- W2018314639 date "1981-06-01" @default.
- W2018314639 modified "2023-09-25" @default.
- W2018314639 title "A capacitance bridge circuit for broadband detection of ion cyclotron resonance signals" @default.
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- W2018314639 doi "https://doi.org/10.1016/0020-7381(81)80122-2" @default.
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