Fourier Transform mass spectrometer ≡ A mass spectrometer wherein an ion placed in a field moves in an orbit at a frequency characteristic of its m/z value. Ions are excited to a coherent orbit and their image current is detected on receiver plates as time domain signal. Fourier transform of the time domain signal results in frequency domain signal which is then converted to a mass spectrum. 听说分辨率可以到小数点后4位，但是价格也高得离谱，貌似要几百万美金一套
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